fb: add general torch support for our app

till now we used an settings overlay. At least all our devices
without torch do not compile the package at all. So check
if package exists if user eg want to setup shortcuts to
torch in settings. Due that our app is needed for torch
and the user will not delete it this is an acceptable way.

see @TorchConstants and @SlimActions

Change-Id: I208fb310fbd0596dd9956d6a2c7fe106859bb4d6
fb: fetch navbar glow color from color.xml

better for new theming engine which will come in future

and now I will start doing again usefull patches lol. Just
needed to do something other.

Change-Id: I35dde45e47c59a2407c191d0077f0adb91f32381
Fix: external storage problem NavRing and NavBar applications