Added Create staging method for rawbuffer
Added Assimp.Net new version
-Added addons projects (mostly empty for now)
Added common build targets
Gitignore ignores build folder
Moved all dependencies to externals
Clean Up
Better project files
-Device and context use proper condition to build
-Only load logical blends in case we use DirectX11_1
-Effect instance has method to apply counters to uav (fx framework does'nt support that).
Indiect Buffer also supports interface, so we can use without the generic type constraint
-Simple Load/Save for Texture2D in DirectX11