TIGR 1.5

This release offers small, but nice, improvements.
Thanks to @jimon and @r-lyeh for the Win/OpenGL work.

Additions

• Move to OpenGL instead of DX on Windows (@jimon, merged by @r-lyeh)
• Add possibility to draw using OpenGL functions (@jimon, merged by @r-lyeh)
• Limit update rate to vsync

Fixes

• OSX crash when using multiple windows
• OSX memory allocation cleanup
• Keyboard focus problems on Linux and OSX