Launcher2 reworked

Features:
- homescreens and drawer adapts to all DPIs and layouts
- added settings for homescreen, drawer and dock, reachable long pressing homescreen or clicking menu button
- adjusted dock paddings, size and grid

If you wanna test, you can sync from here: https://github.com/PA-n7000/android_packages_apps_Launcher2.git

I've sent this through github as gerrit seems that is not available.