[String] Plumb more Substring.*View APIs through Slice
[String] Plumb more Substring.*View APIs through Slice

Rather than rely on (potentially inefficient) generic specializations,
plumb all Slice APIs explicitly from Substring.*View to
Slice<String.*View>.

aschwaighofer/swift,brentdax/swift,shajrawi/swift,xedin/swift,glessard/swift,harlanhaskins/swift,karwa/swift,gregomni/swift,parkera/swift,rudkx/swift,practicalswift/swift,benlangmuir/swift,xedin/swift,lorentey/swift,jckarter/swift,jckarter/swift,hooman/swift,aschwaighofer/swift,jmgc/swift,shajrawi/swift,huonw/swift,karwa/swift,aschwaighofer/swift,xedin/swift,lorentey/swift,JGiola/swift,xwu/swift,huonw/swift,practicalswift/swift,gribozavr/swift,lorentey/swift,sschiau/swift,glessard/swift,tkremenek/swift,shahmishal/swift,xedin/swift,gregomni/swift,brentdax/swift,sschiau/swift,glessard/swift,stephentyrone/swift,devincoughlin/swift,harlanhaskins/swift,alblue/swift,hooman/swift,gribozavr/swift,hooman/swift,jmgc/swift,shajrawi/swift,apple/swift,allevato/swift,danielmartin/swift,ahoppen/swift,roambotics/swift,danielmartin/swift,xwu/swift,nathawes/swift,gribozavr/swift,devincoughlin/swift,austinzheng/swift,nathawes/swift,JGiola/swift,devincoughlin/swift,gribozavr/swift,shajrawi/swift,austinzheng/swift,brentdax/swift,JGiola/swift,glessard/swift,brentdax/swift,huonw/swift,nathawes/swift,CodaFi/swift,natecook1000/swift,parkera/swift,atrick/swift,gribozavr/swift,amraboelela/swift,nathawes/swift,karwa/swift,aschwaighofer/swift,tkremenek/swift,rudkx/swift,stephentyrone/swift,aschwaighofer/swift,xwu/swift,nathawes/swift,devincoughlin/swift,stephentyrone/swift,harlanhaskins/swift,sschiau/swift,sschiau/swift,JGiola/swift,natecook1000/swift,xedin/swift,benlangmuir/swift,amraboelela/swift,airspeedswift/swift,natecook1000/swift,CodaFi/swift,lorentey/swift,gregomni/swift,roambotics/swift,parkera/swift,danielmartin/swift,JGiola/swift,tkremenek/swift,gregomni/swift,gregomni/swift,harlanhaskins/swift,roambotics/swift,alblue/swift,parkera/swift,karwa/swift,jmgc/swift,apple/swift,allevato/swift,allevato/swift,lorentey/swift,karwa/swift,danielmartin/swift,airspeedswift/swift,tkremenek/swift,huonw/swift,amraboelela/swift,shahmishal/swift,shajrawi/swift,stephentyrone/swift,xwu/swift,glessard/swift,xedin/swift,ahoppen/swift,xwu/swift,xedin/swift,jmgc/swift,ahoppen/swift,jmgc/swift,alblue/swift,amraboelela/swift,austinzheng/swift,huonw/swift,airspeedswift/swift,atrick/swift,rudkx/swift,sschiau/swift,shahmishal/swift,hooman/swift,roambotics/swift,parkera/swift,karwa/swift,roambotics/swift,amraboelela/swift,shahmishal/swift,shahmishal/swift,jopamer/swift,sschiau/swift,xwu/swift,karwa/swift,danielmartin/swift,alblue/swift,airspeedswift/swift,harlanhaskins/swift,benlangmuir/swift,huonw/swift,shahmishal/swift,nathawes/swift,CodaFi/swift,alblue/swift,glessard/swift,jckarter/swift,austinzheng/swift,practicalswift/swift,tkremenek/swift,alblue/swift,JGiola/swift,austinzheng/swift,ahoppen/swift,atrick/swift,airspeedswift/swift,roambotics/swift,tkremenek/swift,hooman/swift,ahoppen/swift,parkera/swift,gribozavr/swift,shajrawi/swift,nathawes/swift,brentdax/swift,rudkx/swift,benlangmuir/swift,devincoughlin/swift,xwu/swift,lorentey/swift,practicalswift/swift,ahoppen/swift,harlanhaskins/swift,benlangmuir/swift,shajrawi/swift,amraboelela/swift,natecook1000/swift,allevato/swift,apple/swift,hooman/swift,amraboelela/swift,austinzheng/swift,practicalswift/swift,apple/swift,shahmishal/swift,stephentyrone/swift,jckarter/swift,sschiau/swift,jopamer/swift,rudkx/swift,jopamer/swift,airspeedswift/swift,austinzheng/swift,apple/swift,apple/swift,hooman/swift,aschwaighofer/swift,jopamer/swift,jckarter/swift,tkremenek/swift,jopamer/swift,karwa/swift,lorentey/swift,rudkx/swift,natecook1000/swift,atrick/swift,atrick/swift,shajrawi/swift,danielmartin/swift,natecook1000/swift,harlanhaskins/swift,brentdax/swift,parkera/swift,jckarter/swift,stephentyrone/swift,airspeedswift/swift,allevato/swift,CodaFi/swift,jckarter/swift,jopamer/swift,devincoughlin/swift,CodaFi/swift,natecook1000/swift,devincoughlin/swift,practicalswift/swift,danielmartin/swift,huonw/swift,CodaFi/swift,practicalswift/swift,sschiau/swift,lorentey/swift,aschwaighofer/swift,allevato/swift,jmgc/swift,jopamer/swift,devincoughlin/swift,gribozavr/swift,gregomni/swift,benlangmuir/swift,stephentyrone/swift,jmgc/swift,xedin/swift,gribozavr/swift,allevato/swift,atrick/swift,parkera/swift,practicalswift/swift,brentdax/swift,shahmishal/swift,alblue/swift,CodaFi/swift