Added scratch sub-project for reduced test compile times while prototyping.
Added scratch sub-project for reduced test compile times while prototyping.

joescii/shapeless,liff/shapeless,tek/shapeless,isaka/shapeless,TomasMikula/shapeless,milessabin/shapeless,fthomas/shapeless,triggerNZ/shapeless,lambdista/shapeless,lukasz-golebiewski/shapeless,khronnuz/shapeless,alexarchambault/shapeless,notxcain/shapeless,Atry/shapeless,clhodapp/shapeless,wheaties/shapeless,roberth/shapeless,malcolmgreaves/shapeless