Merge pull request cimgui#76 from cimgui/master_refactor

Master refactor

Merge pull request cimgui#74 from sonoro1234/ImVector_templates

add ImVector template types

constructors exposed

add igGetIDRange to overloads table

explain this repo option for generating

Makefile with optimization

move to imgui 1.65

move to imgui 1.64

take care of space before brackets in function

prepare 1.62.0-beta