Frameworks: Support advanced lockscreen shortcuts

Lockscreen shortcuts reworked to support advanced targets
like Camera, Phone, Folder in the browser, a contact...
PS2: fixed some copy/paste garbage
PS3: Got -1 from kufikugel for a missing white space before a bracket :p
Change-Id: I15be30d5e2e2ef230bb85e325d5b7bbe7835cff5
Add keymapping for select BT headsets

Per CYAN-522, select BT headsets (e.g. Jabra Street, Jabra BT3030, etc)
send key 159 for fast-forward button, instead of the expected key 208.

Need's testing with affected BT devices.

Change-Id: I06ba689f77dd1058fb82b1de9f72b4df59150cf9
Lockscreen: Fix mdpi layout issues

Before: http://i.imgur.com/gXNUt97.png
After: http://i.imgur.com/ppevA6M.png

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: I5bc893f12096d288d04d7cfa442b471002178a3a