[utils] gyb: use % instead of @
[utils] gyb: use % instead of @

It was hard to decide on a replacement character for @, which is a
particularly bad choice for gyb ever since we started using it for
attributes in Swift, since attributes often start a line.  Only
graphically-dense characters seem to look right.  '%' has the
disadvantage of clashing with SIL, where it begins many lines, but we're
not using gyb to generate any SIL files today, so I optimized for the
common case.

Swift SVN r14483

allevato/swift,tardieu/swift,SwiftAndroid/swift,kperryua/swift,slavapestov/swift,shahmishal/swift,alblue/swift,aschwaighofer/swift,rudkx/swift,danielmartin/swift,gribozavr/swift,sdulal/swift,tjw/swift,kusl/swift,KrishMunot/swift,mightydeveloper/swift,khizkhiz/swift,xwu/swift,ahoppen/swift,gregomni/swift,ahoppen/swift,codestergit/swift,jmgc/swift,uasys/swift,jopamer/swift,tardieu/swift,dduan/swift,jmgc/swift,aschwaighofer/swift,MukeshKumarS/Swift,swiftix/swift.old,benlangmuir/swift,apple/swift,tkremenek/swift,CodaFi/swift,lorentey/swift,milseman/swift,xedin/swift,gregomni/swift,rudkx/swift,kstaring/swift,kperryua/swift,LeoShimonaka/swift,alblue/swift,gribozavr/swift,sdulal/swift,gottesmm/swift,danielmartin/swift,JaSpa/swift,brentdax/swift,tinysun212/swift-windows,djwbrown/swift,benlangmuir/swift,jtbandes/swift,roambotics/swift,jckarter/swift,aschwaighofer/swift,swiftix/swift,emilstahl/swift,glessard/swift,mightydeveloper/swift,benlangmuir/swift,mightydeveloper/swift,ken0nek/swift,russbishop/swift,JGiola/swift,ahoppen/swift,shajrawi/swift,swiftix/swift,djwbrown/swift,gribozavr/swift,djwbrown/swift,hughbe/swift,apple/swift,tkremenek/swift,CodaFi/swift,harlanhaskins/swift,johnno1962d/swift,atrick/swift,stephentyrone/swift,OscarSwanros/swift,austinzheng/swift,stephentyrone/swift,kperryua/swift,allevato/swift,kperryua/swift,modocache/swift,emilstahl/swift,kperryua/swift,KrishMunot/swift,manavgabhawala/swift,IngmarStein/swift,practicalswift/swift,manavgabhawala/swift,tinysun212/swift-windows,roambotics/swift,jckarter/swift,shahmishal/swift,jopamer/swift,OscarSwanros/swift,ben-ng/swift,kentya6/swift,return/swift,shahmishal/swift,nathawes/swift,jopamer/swift,kusl/swift,shajrawi/swift,airspeedswift/swift,apple/swift,devincoughlin/swift,kentya6/swift,CodaFi/swift,russbishop/swift,MukeshKumarS/Swift,atrick/swift,emilstahl/swift,ben-ng/swift,mightydeveloper/swift,brentdax/swift,JGiola/swift,JaSpa/swift,Ivacker/swift,calebd/swift,JGiola/swift,harlanhaskins/swift,codestergit/swift,arvedviehweger/swift,airspeedswift/swift,frootloops/swift,Jnosh/swift,shajrawi/swift,return/swift,felix91gr/swift,johnno1962d/swift,dreamsxin/swift,kstaring/swift,deyton/swift,amraboelela/swift,tinysun212/swift-windows,return/swift,modocache/swift,zisko/swift,practicalswift/swift,apple/swift,cbrentharris/swift,austinzheng/swift,karwa/swift,stephentyrone/swift,cbrentharris/swift,OscarSwanros/swift,tinysun212/swift-windows,gmilos/swift,shajrawi/swift,atrick/swift,swiftix/swift.old,dduan/swift,ken0nek/swift,gribozavr/swift,brentdax/swift,swiftix/swift,austinzheng/swift,devincoughlin/swift,therealbnut/swift,JaSpa/swift,parkera/swift,ken0nek/swift,jckarter/swift,devincoughlin/swift,kentya6/swift,deyton/swift,zisko/swift,modocache/swift,allevato/swift,bitjammer/swift,xwu/swift,kusl/swift,lorentey/swift,manavgabhawala/swift,kusl/swift,kstaring/swift,felix91gr/swift,shahmishal/swift,modocache/swift,brentdax/swift,huonw/swift,airspeedswift/swift,cbrentharris/swift,slavapestov/swift,airspeedswift/swift,slavapestov/swift,bitjammer/swift,tkremenek/swift,harlanhaskins/swift,tkremenek/swift,swiftix/swift,practicalswift/swift,gregomni/swift,xedin/swift,roambotics/swift,khizkhiz/swift,apple/swift,calebd/swift,slavapestov/swift,tjw/swift,xedin/swift,SwiftAndroid/swift,sdulal/swift,xedin/swift,gottesmm/swift,hughbe/swift,OscarSwanros/swift,karwa/swift,Jnosh/swift,parkera/swift,frootloops/swift,ahoppen/swift,manavgabhawala/swift,xwu/swift,brentdax/swift,LeoShimonaka/swift,swiftix/swift.old,SwiftAndroid/swift,Ivacker/swift,lorentey/swift,swiftix/swift.old,milseman/swift,jmgc/swift,natecook1000/swift,jopamer/swift,rudkx/swift,jtbandes/swift,CodaFi/swift,MukeshKumarS/Swift,zisko/swift,kstaring/swift,LeoShimonaka/swift,Jnosh/swift,adrfer/swift,jmgc/swift,modocache/swift,glessard/swift,stephentyrone/swift,KrishMunot/swift,dduan/swift,codestergit/swift,roambotics/swift,devincoughlin/swift,amraboelela/swift,SwiftAndroid/swift,swiftix/swift.old,return/swift,milseman/swift,slavapestov/swift,arvedviehweger/swift,stephentyrone/swift,emilstahl/swift,dduan/swift,hooman/swift,adrfer/swift,amraboelela/swift,KrishMunot/swift,tjw/swift,manavgabhawala/swift,practicalswift/swift,kentya6/swift,sschiau/swift,shahmishal/swift,swiftix/swift,MukeshKumarS/Swift,kentya6/swift,jopamer/swift,mightydeveloper/swift,frootloops/swift,JaSpa/swift,devincoughlin/swift,felix91gr/swift,jmgc/swift,deyton/swift,danielmartin/swift,tardieu/swift,natecook1000/swift,tkremenek/swift,hughbe/swift,jckarter/swift,hooman/swift,felix91gr/swift,parkera/swift,Ivacker/swift,OscarSwanros/swift,LeoShimonaka/swift,allevato/swift,xedin/swift,xwu/swift,IngmarStein/swift,sschiau/swift,gottesmm/swift,SwiftAndroid/swift,xedin/swift,emilstahl/swift,karwa/swift,austinzheng/swift,brentdax/swift,gmilos/swift,xwu/swift,gmilos/swift,stephentyrone/swift,parkera/swift,arvedviehweger/swift,sschiau/swift,tkremenek/swift,sdulal/swift,parkera/swift,MukeshKumarS/Swift,Ivacker/swift,khizkhiz/swift,ben-ng/swift,tardieu/swift,milseman/swi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