[build-script] Factor out an Invocation helper object.
[build-script] Factor out an Invocation helper object.

 - This is an object designed to represent a single invocation of the build
   script, primarily for use in decomposing the main program flow into its
   distinct conceptual pieces.

gmilos/swift,manavgabhawala/swift,airspeedswift/swift,Jnosh/swift,russbishop/swift,aschwaighofer/swift,hooman/swift,sschiau/swift,alblue/swift,austinzheng/swift,aschwaighofer/swift,uasys/swift,allevato/swift,hooman/swift,gottesmm/swift,allevato/swift,glessard/swift,lorentey/swift,shajrawi/swift,roambotics/swift,airspeedswift/swift,benlangmuir/swift,nathawes/swift,amraboelela/swift,austinzheng/swift,modocache/swift,zisko/swift,deyton/swift,kstaring/swift,jmgc/swift,atrick/swift,bitjammer/swift,jmgc/swift,austinzheng/swift,kperryua/swift,aschwaighofer/swift,deyton/swift,CodaFi/swift,modocache/swift,felix91gr/swift,sschiau/swift,danielmartin/swift,hughbe/swift,benlangmuir/swift,danielmartin/swift,gmilos/swift,OscarSwanros/swift,CodaFi/swift,shahmishal/swift,apple/swift,arvedviehweger/swift,lorentey/swift,uasys/swift,russbishop/swift,ben-ng/swift,tardieu/swift,lorentey/swift,Jnosh/swift,manavgabhawala/swift,roambotics/swift,return/swift,zisko/swift,zisko/swift,natecook1000/swift,jckarter/swift,gottesmm/swift,aschwaighofer/swift,therealbnut/swift,ahoppen/swift,uasys/swift,glessard/swift,tjw/swift,airspeedswift/swift,manavgabhawala/swift,JaSpa/swift,brentdax/swift,karwa/swift,calebd/swift,karwa/swift,benlangmuir/swift,ben-ng/swift,brentdax/swift,ahoppen/swift,rudkx/swift,allevato/swift,IngmarStein/swift,uasys/swift,swiftix/swift,devincoughlin/swift,xedin/swift,airspeedswift/swift,JGiola/swift,milseman/swift,apple/swift,shajrawi/swift,frootloops/swift,jckarter/swift,uasys/swift,gribozavr/swift,huonw/swift,amraboelela/swift,tinysun212/swift-windows,gottesmm/swift,shahmishal/swift,tjw/swift,modocache/swift,parkera/swift,devincoughlin/swift,tinysun212/swift-windows,atrick/swift,xwu/swift,jmgc/swift,harlanhaskins/swift,OscarSwanros/swift,swiftix/swift,harlanhaskins/swift,gregomni/swift,jtbandes/swift,karwa/swift,tkremenek/swift,swiftix/swift,calebd/swift,devincoughlin/swift,xedin/swift,codestergit/swift,alblue/swift,shajrawi/swift,jopamer/swift,milseman/swift,sschiau/swift,devincoughlin/swift,JaSpa/swift,shahmishal/swift,tardieu/swift,rudkx/swift,amraboelela/swift,huonw/swift,jtbandes/swift,tkremenek/swift,felix91gr/swift,brentdax/swift,tjw/swift,gregomni/swift,nathawes/swift,JGiola/swift,russbishop/swift,hughbe/swift,jmgc/swift,manavgabhawala/swift,JGiola/swift,danielmartin/swift,sschiau/swift,tkremenek/swift,xedin/swift,zisko/swift,djwbrown/swift,jckarter/swift,hughbe/swift,jtbandes/swift,devincoughlin/swift,roambotics/swift,benlangmuir/swift,apple/swift,gribozavr/swift,JaSpa/swift,nathawes/swift,brentdax/swift,gribozavr/swift,tkremenek/swift,modocache/swift,IngmarStein/swift,natecook1000/swift,felix91gr/swift,codestergit/swift,rudkx/swift,OscarSwanros/swift,tardieu/swift,huonw/swift,benlangmuir/swift,milseman/swift,hooman/swift,djwbrown/swift,shajrawi/swift,djwbrown/swift,therealbnut/swift,shahmishal/swift,devincoughlin/swift,shahmishal/swift,tinysun212/swift-windows,frootloops/swift,stephentyrone/swift,return/swift,brentdax/swift,practicalswift/swift,return/swift,nathawes/swift,glessard/swift,Jnosh/swift,hughbe/swift,russbishop/swift,stephentyrone/swift,jckarter/swift,deyton/swift,roambotics/swift,swiftix/swift,OscarSwanros/swift,xwu/swift,xedin/swift,jtbandes/swift,gribozavr/swift,hughbe/swift,frootloops/swift,rudkx/swift,amraboelela/swift,codestergit/swift,return/swift,practicalswift/swift,stephentyrone/swift,huonw/swift,arvedviehweger/swift,calebd/swift,manavgabhawala/swift,nathawes/swift,shahmishal/swift,austinzheng/swift,sschiau/swift,practicalswift/swift,JaSpa/swift,Jnosh/swift,tjw/swift,calebd/swift,gmilos/swift,shahmishal/swift,swiftix/swift,jckarter/swift,arvedviehweger/swift,return/swift,kstaring/swift,swiftix/swift,tardieu/swift,natecook1000/swift,stephentyrone/swift,apple/swift,djwbrown/swift,djwbrown/swift,gregomni/swift,lorentey/swift,practicalswift/swift,danielmartin/swift,deyton/swift,xwu/swift,manavgabhawala/swift,devincoughlin/swift,CodaFi/swift,tardieu/swift,jmgc/swift,karwa/swift,return/swift,therealbnut/swift,nathawes/swift,ben-ng/swift,deyton/swift,karwa/swift,kperryua/swift,apple/swift,atrick/swift,arvedviehweger/swift,hooman/swift,karwa/swift,gmilos/swift,glessard/swift,hooman/swift,kperryua/swift,karwa/swift,alblue/swift,kstaring/swift,harlanhaskins/swift,IngmarStein/swift,airspeedswift/swift,gribozavr/swift,JGiola/swift,frootloops/swift,hooman/swift,kstaring/swift,codestergit/swift,jtbandes/swift,jtbandes/swift,shajrawi/swift,russbishop/swift,nathawes/swift,CodaFi/swift,kperryua/swift,rudkx/swift,roambotics/swift,karwa/swift,CodaFi/swift,milseman/swift,OscarSwanros/swift,practicalswift/swift,CodaFi/swift,shajrawi/swift,atrick/swift,kperryua/swift,tjw/swift,jmgc/swift,huonw/swift,tinysun212/swift-windows,gmilos/swift,parkera/swift,deyton/swift,harlanhaskins/swift,gmilos/swift,gottesmm/swift,shahmishal/swift,parkera/swift,xedin/swift,danielmartin/swift,lorentey/swift,huonw/swift,Jnosh/swift,modocache/swift,stephentyrone/swift,milseman/swift,tinysun212/swift-windows,therealbnut/swift,practicalswift/swift,russbishop/swift,zisko/swift,tjw/swift,manavgabhawala/swift,danielmartin/swift,JaSpa/swift,shajrawi/swift,stephentyrone/swift,ahoppen/swift,gottesmm/swift,gmilos/swift,tinysun212/swift-windows,amraboelela/swift,brentdax/swift,codestergit/swift,IngmarStein/swift,jopamer/swift,gribozavr/swift,parkera/swift,glessard/swift,therealbnut/swift,kstaring/swift,jopamer/swift,hughbe/swift,parkera/swift,practicalswift/swift,ben-ng/swift,sschiau/swift,tkremenek/swift,therealbnut/swift,JGiola/swift,jopamer/swift,practicalswift/swift,calebd/swift,parkera/swift,kstaring/swift,kperryua/swift,harlanhaskins/swift,bitjammer/swift,return/swift,ben-ng/swift,lorentey/swift,hughbe/swift,harlanhaskins/swift,aschwaighofer/swift,therealbnut/swift,gribozavr/swift,tkremenek/swift,bitjammer/swift,tjw/swift,jopamer/swift,calebd/swift,natecook1000/swift,uasys/swift,austinzheng/swift,JaSpa/swift,Jnosh/swift,xwu/swift,jckarter/swift,jckarter/swift,natecook1000/swift,alblue/swift,ben-ng/swift,codestergit/swift,sschiau/swift,swiftix/swift,natecook1000/swift,allevato/swift,amraboelela/swift,arvedviehweger/swift,jopamer/swift,gottesmm/swift,apple/swift,parkera/swift,austinzheng/swift,parkera/swift,IngmarStein/swift,tinysun212/swift-windows,kperryua/swift,stephentyrone/swift,airspeedswift/swift,russbishop/swift,ahoppen/swift,xwu/swift,xwu/swift,gregomni/swift,jmgc/swift,calebd/swift,austinzheng/swift,gottesmm/swift,modocache/swift,CodaFi/swift,ben-ng/swift,devincoughlin/swift,lorentey/swift,deyton/swift,alblue/swift,tardieu/swift,OscarSwanros/swift,airspeedswift/swift,ahoppen/swift,harlanhaskins/swift,shajrawi/swift,tkremenek/swift,alblue/swift,djwbrown/swift,xedin/swift,felix91gr/swift,zisko/swift,codestergit/swift,arvedviehweger/swift,modocache/swift,gregomni/swift,atrick/swift,frootloops/swift,ahoppen/swift,danielmartin/swift,jopamer/swift,milseman/swift,natecook1000/swift,frootloops/swift,amraboelela/swift,felix91gr/swift,huonw/swift,arvedviehweger/swift,Jnosh/swift,allevato/swift,bitjammer/swift,bitjammer/swift,sschiau/swift,felix91gr/swift,milseman/swift,frootloops/swift,hooman/swift,allevato/swift,xedin/swift,allevato/swift,IngmarStein/swift,xwu/swift,zisko/swift,aschwaighofer/swift,bitjammer/swift,JaSpa/swift,gribozavr/swift,uasys/swift,jtbandes/swift,bitjammer/swift,JGiola/swift,gregomni/swift,tardieu/swift,benlangmuir/swift,brentdax/swift,glessard/swift,lorentey/swift,atrick/swift,OscarSwanros/swift,aschwaighofer/swift,kstaring/swift,roambotics/swift,felix91gr/swift,xedin/swift,alblue/swift,IngmarStein/swift,djwbrown/swift,rudkx/swift