Frameworks: SlimRecents - add TRDS

replaced xml drawable with 9patch drawable to remove the overdraw

moved opt cards drawables into opt cards repo

Change-Id: I8ca379337298dcfc33b9ea288ea15440a2e0b0b4

Conflicts:
	packages/SystemUI/res/drawable-holodark-hdpi/recent_bg_dropshadow.9.png
	packages/SystemUI/res/drawable-holodark-mdpi/recent_bg_dropshadow.9.png
	packages/SystemUI/res/drawable-holodark-xhdpi/recent_bg_dropshadow.9.png
	packages/SystemUI/res/drawable-holodark-xxhdpi/recent_bg_dropshadow.9.png