Merge pull request #161 from dariomanesku/master

Minor imgui changes + removed bgfx::*Mask() API from 13-stencil and 14-shadowvolumes.
Removed *Mask API.
Updated README.
Fixed RenderDoc crash when IntelGPA is present.
Cleanup.
Updated README.
Updated README.
OSX: Added more key translation.
Merge branch 'master' of github.com:bkaradzic/bgfx
GLX: Added swap chain support.
Added Index Buffer Compression.
Fixed ib-compress to build with vs2008. Added 16-bit indices support.
Made ib-compress files lowercase.
Added link to blog post.
Win: Don't let OS destroy window. Fixes issue #162.
Updated ib-compress.
DX11: Allow lost device for few frames.
Fixed 22-windows example.
Fixed issue #164.
OSX: Fixed window resize.