Stop building recovery
envsetup.sh:Cleanup
Colorize build success/failure message.

Change-Id: I8901689876e65f5b72050c40e1580f167e49c2b0
Allow prebuilted apks
build: Ensure /system unmounted at install start

Account for the possibility that a user has mounted system manually
before installing the FullOTA package.

Change-Id: I97d0540676a7ce98762545e76ecb1a7f6335d204
Recovery: remove wiping of res folder

The rm -rf of the res folder wipes out all of the TWRP theme and
images. Remove this so that TWRP will work properly.

Change-Id: I27c372d53eaae3cc8b476a909c2d3f3fc4fcb558