Merge pull request #947 from criptych/fix-camerafitter-consts

Fix const definitions for MOAICameraAnchor2D and MOAICameraFitter2D
Implement fullscreen and window resize handling support in host-sdl.

Adds fullscreen support to host-sdl by first trying to enter fullscreen
at the current window resolution; if that fails, it tries again at the
current desktop resolution.  Also adds window resize event handling so
applications will respond to the resolution change properly.
Implement mousewheel and touch support in host-sdl.

Add mousewheel and touch input event handling to host-sdl; start adding
multiple joystick event handling.
Merge branch 'custom' of https://github.com/criptych/moai-dev into custom