Android: Create drawable directories if they dont exist

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>
Fail if smaller than 48mb

* 50 (52428800 B specifically) may be too high, even with assets included

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>
kodi.mk: Add another apk target

* Now have one with obb, one without obb or assets, and one with assets

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>