Add the AntAppSkeleton with AntTweakBar integrated.
Added input callbacks, AntTweakBar is partly functional.
Plugged in missing char and wheel callbacks, bar still broken.
Works a lot better with the variables in scope.
Merge branch 'master' of https://github.com/jimbo00000/OpenGLMultiSkeleton
Add -1 state to which_button to fix mouse action in glfw2/Tri.
Add Ant support to glfw2 target.
Plugged in callback fallthroughs, key action still broken in Ant.
Add a variable to CMakeLists.txt to toggle use of AntTweakBar.