ImWindow

• Add autobuild with AppVeyor
  • Add BGFX sample
  • Add class ImwMenu and remove OnMenu from ImwWindow
  • Add Toolbar system and class ImwToolbar
  • Add OnContextMenu virtual function for ImwWindow
  • Add ability to inherited ImwWindow
  • Add customization of tabs rendering
  • Add ability to focus an ImwWindow
  • Add ability to save/load layout (but need to implement an instanti...

• Many improves
• Add SFF (one config file, one header file and one source file) like STB or ImGui.

Include Demo DirectX 11 32 bits demo