[1/2] Notification Shortcuts by SlimRoms

beside our unique slim feature this patch adds

- all system shortcut icons we need for this and other stuff in future
- basice slim helper and constants classes we need later as well
- device utils helper
- preparation for other shortcut features
- and of course our notification shortcuts feature

compared to 4.3 some fixes were added + adapting to 4.4

xxhdpi icons thanks to kroz again

PS2 update Author & message
PS3 rebase & fix conflicts
PS4 deleted ~.file

Change-Id: I88961d1f58728eaee843fb8076104ad130333b30