[MOD] Reorder the include directives in different files
[MOD] Remove namespace ogl
[FIX] The install name was set to /Library/Frameworks/OGLUIKit.framework/Versions/A/OGLUIKit. So if an App link this framework, the framework ought to be present in /Library/Frameworks thanks to the use of @executable_path we can set this attribute dynamically. The new install name is set to  @executable_path/../Frameworks/OGLUIKit.framework/Versions/A/OGLUIKit where @executable_path is the path of the executable (by example /User/Applications/<MyApp>.app/Contents/MacOS)
[MOD] Replace unnecessary .mm by .m