Add FileExplorer && ThemeManager

Change-Id: I57103411e2b547b14e1ca52e710c31b2dc617a40
use our launcher3

Change-Id: Iabe05121e6db6d8670192dcd699382ebbf1bd7e1
Remove qrngd

This is built into init now.

Change-Id: I0af96c62652f87900773b2d1c2e72a71c30ff3a3
use our camera2 and LegacyCamera repo

Change-Id: I4fa03cdd42ab7d3b911d2efffc3a98293691067f
user our PackageInstaller and DownloadProvider app

Change-Id: I2075a3d644dda913b8b60a5caa80b6daa7393716