Stop memory management on blanking overlay graphics

This prevents a crash in TWRP when trying to blank
the screen on devices that are using overlay graphics.

Change-Id: I155868616ffa1b211e97be97e4abe8b03dad7ca0
Allow using variables and addition/subtraction in variables

Change-Id: I1acba95302e414e1a471d27474508a7c48df0328
Add possibility to use images as background or handle of slidevalue

* Add tag <resource background="x" handle="y" handlehover="z" />
  to the slidervalue object.
* All images are optional, e.g. you can use just handle or just
  background image or no images whatsoever

Change-Id: Ie0fee92965c6e883c4e532732756008dcc9e385e
Signed-off-by: Vojtech Bocek <vbocek@gmail.com>
remove stray test file
exfatfsck: ELF 64-bit LSB  executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=c91c3e4c1e542e4a40bcad47ac747f62fb7312f9, not stripped

Change-Id: I32472d460a8f03776e1d215810c537b029789220
removing logging test file
updating gitignores to keep file from coming back
adding gedit backups to gitignores

Change-Id: I36d55983b34d47763cb56abf784381c06d951302
Set font based on resolution if not set already

Change-Id: I6efaeb1c508c06513ac9ace7aa72a2eefa0cb1bb
TW_SCREEN_BLANK_ON_BOOT will jolt the screen/touch driver.

If on the default settings the screen will only kick in to action
AFTER it has gone to sleep once and has been woken up again with a
key press, this will be needed to set to 'true' in the
BoardConfig.mk

The code was already there, Dees_Troy and I thought it would be
nice to make it a switch to control at compile time.

Change-Id: I5116a27afe9cba57122761c192ea3ee153d98162