[Core] Add IsDisposed safeguard to Dispose method
[Core] Add IsDisposed safeguard to Dispose method

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