More audio context work
Work on audio
AudioBuffer feeds into AudioSource, make AudioSource handle context-specific functions to pause/play/etc
Compile fix
Stub some additional functionality for audio
Refactor into Image and ImageBuffer
Restore Image as the default container type, with ImageBuffer underneath
Disband lime.media, create lime.audio and lime.math
Update samples
Working on Lime Image methods
Clean up Image class
Image improvements, compile fix
Image improvements
Runtime fix
Add getPixels/setPixels
Compile fix
Some handling for premultiplied data, color matrix fix
Merge branch 'next' of https://github.com/openfl/lime into text-harfbuzz

Conflicts:
	lime/graphics/Font.hx
	project/include/graphics/Font.h
	project/src/ExternalInterface.cpp
	project/src/graphics/Font.cpp