Have rewritten some part  C++ code to C. Now in imgui have only C code.
Resolve errors when compiled in msvc2010.
* premake4.lua: Added few condition for premake commands: vs2010, gmake, clean. And now for compile project you should write for example, like that:
           ./premake4 gmake
  			cd gmake
			make
* .gitignore: Added ignore folders
Tiny changes