Normally, when the display has been turned off by blanktimer, the GUI actually still renders the GUI elements (eg. progressbar while doing backup/restore/etc.)
This patch will check whenever the display is turned off, and if it is turned off simply dont render. This avoids heating up the device and will save battery.
Will also set overlay to lockscreen so we don't have inadvetent screen selections.
Touching the screen will bring the display back up.
add back check script for poweroff
move diff time function to twrp-functions.cpp
make sure we chmod after copy_file
add read_file and write_file functions to twrp-functions.cpp
make single thread
try to force update screen
add forceRender
drop caches after tar processing
Change-Id: I3c5c509dd39dbb05451bbfe5d8b56d53c90d8d1b
