Implement DocumentsProvider.createDocument and deleteDocument

Fixes AOSPA-431
This is needed to delete and create files/folders in DocumentsUI.
Some open questions are:
1. Are the methods implementented according to their description?
E.g I'm not sure whether deleteDocument should be able to delete folders, too.
2. I first didn't want to modify public API, but deleting files from within DocumentsUI somehow doesn't work - file.canWrite() always returns false
3. So is modfying the API this way OK?

Change-Id: Ie3a9d1888decaa0f08de1a5183ffd23760be15b9
Fix hot reboot in powermenu

Fixes AOSPA-557
Accessing showGlobalActionsDialog() from different threads
(one for broadcasts and one for the actual longpress power button action)
caused a hot reboot when accessing the power menu from quick settings and then from power button.

Change-Id: I4b6efd192404f073c0d1b5655152ae736a398cbd
Pie: Fix navigation icon hints being cleared on reorientation

There is no reason to recreate the PieControlPanel instance if it already exists.

Change-Id: Id7bb4946a8fbd4595e840c605b90b97cab7b38ca
Themes: Fix icon support for secondary users.

This fixes the problem when switching to a secondary user and
icons are currently applied.  Prior to this patch the secondary
user would see droids as their icons and apps would FC at start.

Change-Id: Icd4275eae5868612bf2a81b375ac4d0779a61395
Themes: Don't create idmap if app doesn't have resources.arsc

Some apps do not have a restable but some legacy themes
try to theme these apps anyways. In this case we skip
the idmap creation process.

Change-Id: I8bc60984299791733d4fe8c9bbcaa75eca6d736b
Themes: Install themes and icon packs for secondary users.

Change-Id: I48ae6835223510a433642fced5b96b6c3954baf6
Themes: Remove DEFAULT_THEME_APPLIED_ON_FIRST_BOOT

doApplyDefaultTheme should be able to apply the default theme, if
one exists, whenever applyDefaultTheme() is called.

Change-Id: Ia50b4089d122855a4ddde91a02eef33ed3f9eaf4

Conflicts:
	core/java/android/provider/Settings.java
Themes: Add status bar and navigation bar to ThemesContract

Change-Id: I8048c735d7bbbfdb86ee5923b95bece6b4252bf7
Themes: Add previews to the themes contract.

Change-Id: I607a6eda1c63a701516d2bc78ca6b705841fbdf7
Merge "Fix hot reboot in powermenu" into kitkat
Merge "Implement DocumentsProvider.createDocument and deleteDocument" into kitkat
Merge "Pie: Fix navigation icon hints being cleared on reorientation" into kitkat
Merge remote-tracking branch 'aospa/kitkat' into HEAD