Add user switcher to lockscreen

Change-Id: I2bb30bf24b9d56a5564d385bd32fdea608b2512b
Improving pie control's user interaction

User feedback showed that it is sometimes difficult to interact
with pie controls. This commit adds some tweaks to how pie
controls react on user touch events.

This changes:
* Pie trigger on LEFT and RIGHT are now more forgiving in the
  initial phase of a swipe. (This should reduce problems when
  trying to activate the pie with a thumb.)
* Pie items are now more sloppy when it comes to focus.

Patch Set #2:
* Removed sloppy focus.

Change-Id: Ib21556ed7f7ff9c6cdbcd1760e94a17c8534706a
Always disable fullscreen keyboard in landscape mode

Change-Id: Ida7a2dc7a49f9ad502075d53c945fa7a2eb37ed3
Merge branch 'CyanKang' into Gerrit