pull imgui master 1.79 and generate

pull imgui docking 1.79 and generate

pull imgui 1.78 and generate

pull imgui 1.78 docking branch and generate

pull imgui master 1.77 and generate

pull imgui docking 1.77 and generate

avoid last , in enums parsing

update README.md

drop cimgui_internal.h generation

pull imgui 1.73