Frameworks: tablet powerwidget management (1/2)

Adds basic powerwidget management for tablet devices
Allows to setup up to 6 different toggles, or remove all of them

patchset 2: remove whitespaces and tabs
patchset 3: remove some other tabs left
patchset 4: some other tabs were hidden
patchset 5: *changed strings for consistency with phone powerwidget
            *added license header on some files
patchset 6: remove WIP tag
patchset 7: remove new created tabs

Change-Id: I2e643401aaac0146857abe8c2d2dbc652d28e666

Conflicts:

	packages/SystemUI/res/layout-sw600dp/status_bar_settings_view.xml
	packages/SystemUI/src/com/android/systemui/statusbar/tablet/SettingsView.java