[Direct3D12] Add simple overload on GraphicsCommandList to clear the whole target (avoiding rect parameter)
[Direct3D12] Add simple overload on GraphicsCommandList to clear the whole target (avoiding rect parameter)

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