More work on default theme.
Significantly improved quality of fonts (only with new fonts generated by gameplay-encoder).
Began process of removing render-to-framebuffer for UI. Forms will now be rendered immediate-mode.
Merge branch 'next' of https://github.com/sgrenier/GamePlay into next

Conflicts:
	samples/browser/res/common/arial.gpb
	samples/browser/res/common/default.theme
	samples/browser/src/FormsSample.cpp
	samples/browser/src/SamplesGame.cpp