Replace Nova Launcher with SlimLauncher

Change-Id: I33ff3fbd5b178d77230abaee14ca2958386a36fe
Bump to 8.4 for weekly

Change-Id: Ic5f03a66ef23d9b1339355613992e84b2ed2cf52
Signed-off-by: Josue Rivera <prbassplayer@gmail.com>
Merge remote-tracking branch 'upstream/kk4.4' into kk4.4