[Build] Restored BeforeClean target to delete generated files as it causes issues only when Visual Studio 'Rebuild' command is used.
[Build] Restored BeforeClean target to delete generated files as it causes issues only when Visual Studio 'Rebuild' command is used.

davidlee80/SharpDX-1,waltdestler/SharpDX,dazerdude/SharpDX,Ixonos-USA/SharpDX,fmarrabal/SharpDX,fmarrabal/SharpDX,weltkante/SharpDX,andrewst/SharpDX,manu-silicon/SharpDX,andrewst/SharpDX,sharpdx/SharpDX,waltdestler/SharpDX,TigerKO/SharpDX,PavelBrokhman/SharpDX,dazerdude/SharpDX,TechPriest/SharpDX,weltkante/SharpDX,jwollen/SharpDX,manu-silicon/SharpDX,PavelBrokhman/SharpDX,VirusFree/SharpDX,mrvux/SharpDX,TechPriest/SharpDX,TigerKO/SharpDX,Ixonos-USA/SharpDX,manu-silicon/SharpDX,weltkante/SharpDX,fmarrabal/SharpDX,Ixonos-USA/SharpDX,sharpdx/SharpDX,davidlee80/SharpDX-1,weltkante/SharpDX,manu-silicon/SharpDX,andrewst/SharpDX,RobyDX/SharpDX,davidlee80/SharpDX-1,davidlee80/SharpDX-1,RobyDX/SharpDX,PavelBrokhman/SharpDX,PavelBrokhman/SharpDX,TigerKO/SharpDX,RobyDX/SharpDX,jwollen/SharpDX,fmarrabal/SharpDX,RobyDX/SharpDX,VirusFree/SharpDX,dazerdude/SharpDX,dazerdude/SharpDX,sharpdx/SharpDX,VirusFree/SharpDX,mrvux/SharpDX,VirusFree/SharpDX,jwollen/SharpDX,mrvux/SharpDX,TechPriest/SharpDX,waltdestler/SharpDX,Ixonos-USA/SharpDX,waltdestler/SharpDX,jwollen/SharpDX,TechPriest/SharpDX,TigerKO/SharpDX