Eliminate 1 frame drawing delay at start of scroll
Launcher: Avoid showing clings if no touchscreen

If the device has no touchscreen the clings are displayed indicating that
"To add an app to your Home screen, touch &amp; hold it.".
Furthermore, having no touchscreen is very difficult to get rid of the
clings because the focus remains on the Launcher.

Change-Id: I26182955fe3d44c51e82b140b5cc2ee3baacf6ca

Conflicts:

	src/com/android/launcher2/Launcher.java
Optimizing Homescreen resume
Adding an extra alignment of the app paged view when leaving the app try to avoid getting stuck in the middle of an animation
Preventing Launcher crash on some folder operations