Trebuchet: Centers vertically the wallpaper

Actually, the wallpaper is not center vertically (both, with wallpaperhack and
without wallpaperhack). This patch modifies:

* Replaces the WallpaperOffsetInterpolator class by the Launcher2 implementation.
* Fixes mWallpaperHack. onDraw now centers the y vertically.
* Disable mWallpaperHack when there is only one homescreen (otherwise a black screen is displayed).

Change-Id: Ia5e0763c9a31609db8f7826f619ed808041e97e7
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Trebuchet: Fix NPE

This change fixes a NPE for the overflow menu. Steps:
1.- A device with no physical menu
2.- Install another launcher (xe Launcher2) (overflow menu is only displayed when Trebuchet runs
outside CM or when multiple launchers exists)
3.- Access AllAppDrawer and tap the overflow menu
4.- Tap again the overflow menu or rotate the screen and tap the overflow menu.
5.- NPE

The overflow menu is not recreated in onCreateOptionsMenu when isWorkspaceLocked(). The change
checks if the user is on the AllAppDrawer and forces the recreation of the menu.

Change-Id: Id68dd1f7b0c09a2f62b5f6d4fbef6f217bf98e82
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Merge "Trebuchet: Centers vertically the wallpaper" into cm-10.1
Trebuchet: Default workspace fixes

* Replace AnalogClockWidget by cLock Widget
* Add "no telephony" workspaces files. New favorites:
    - Phone -> Email
    - Contacts -> Calendar
    - Mms -> Contacts
    - Browser -> Browser
* Add sw600dp and sw700dp update workspaces files

Patchset 2-4: CleanUp

Change-Id: If21559c59995326b93689f89291446a9962274cb
Merge "Trebuchet: Default workspace fixes" into cm-10.1