New Android Framebuffer Scale Enging, with checkbox to select scale method and keep aspect ratio.

increase PLUGIN_BUFFER_SIZE also increase skin memory allowance.
Merge branch 'features/Android-zoom-New'

Conflicts:
	android/src/org/rockbox/RockboxFramebuffer.java
	firmware/export/config/android.h
apply tone control before replaygain to prevent major clipping after replaygain changes.