Fix issue #3215261: NPE in WiFi Settings

And also fix #3343369: EGL_BAD_DISPLAY and/or broadcast intent
TIME_SET before boot completion

And a few more tweaks to animations to keep the wallpaper displayed
when needed.

And make more use of the drag and drop "rotation disabled" thing to
also use it while animating the screen rotation, since if we try to
start a new rotation while doing the animation we end up with a mess.

Change-Id: I373af305a6e23a92835abed96229a83e173f67ce