Frameworks: add ability to change the color in battery saver mode (1/2)

User complain about the ugly orange....give the user the ability to change the
color in status and navigation bar if battery saver mode is activated.

Especially for you Tylog :D

PS
- move it into the observer...method is called to often to call every time
  the settings value for it.

Change-Id: I48ed2e85c462a2e94770b2bc1ad75b1ca40f2304
Merge "Frameworks: add ability to change the color in battery saver mode (1/2)" into lp5.0
Frameworks: Be sure heads up view is attached before removing it

We did not have it in our tests but some user ran into it. Thing is if the
system is disabling notifications for whatever reason and till this time the
view was never attached and the system tries to detach the view on windowmanager
we run into an illegal argument exception.

Fix it with simply checking if the view was attached before removing it.

Change-Id: I0800beed3553815cc529087052138345773b32e4
Merge "Frameworks: Be sure heads up view is attached before removing it" into lp5.0
Merge remote-tracking branch 'slimroms/lp5.0' into lp5.0