CL Volume Indicator and Some Minor ya2d Optimizations

[maodus]

This PR adds:

• A volume indicator in the custom launcher (complete with many work-arounds, thanks Sony!)
• Minor optimizations in CL's ya2d++ by removing redundant dcache writebacks.

IMG_6018.mov

[maodus]

ya2d flushes dcache for textures internally so there is no need to do it again when loading images. I stumbled into there because I think there's a bug in ya2d when drawing small rectangles, the bottom-right 3 pixels of the volume indicator handle dont seem to render haha.

[krazynez]

LGTM - Thanks for adding this ot was much needed.