Merge branch 'master' of https://github.com/ocornut/imgui 

Version 1.72b (patch for nav) 

Version 1.72 

Version 1.71 + comments 

Version 1.70 

Demo: Custom rendering: Minor sizing issue fix. 

Version 1.68 

TODO update + internals: changed order or ImGuiLayoutType enums to al… …low using them for indexing.

Version 1.66b (will revisit how to change IMGUI_VERSION_NUM across ve… …rsions, this commit reduces the numerical IMGUI_VERSION_NUM compared to the commit on Nov 22).

Version 1.66