Got a VERY rough Mac build going.
Merge branch 'master' of git.zethes.com:~/Zethes/Jatta

Conflicts:
	src/Jatta/External/Once.h
Fixed some issues on Windows and added a new "image" example.
Mac builds are still pretty rough, but they kinda work now.
Improving OpenGL and added a WIP 3D world example.
Minor changes.
Merge branch 'master' of git.zethes.com:~/Zethes/Jatta
Improving OpenGL wrapper and adding Assimp wrapper.
Fixing some build issues.
Fixed some small issues in VS build.
More OpenGL improvements.
Made many improvements to the OpenGL wrapper.