settings: Unbreak wifi display on tablets

In change 46af8086db0db5b41f20c9f05a5f42c182262576 the option
to enable/disable the wireless display was moved to an action
bar which ends up entirely removing the ability to enable it
for devices using Settings in tablet (multi-pane) mode.

Follow the pattern of dreamcast which correctly displays
and removes the action bar.

Change-Id: Ie82b04b5e96a59ec093323601f8e79d23a6e69de

Conflicts:

	src/com/android/settings/wfd/WifiDisplaySettings.java
settings: Auto-brightness levels shouldn't fill the screen

On tall displays this ends up with a lot of useless padding
in the list.

Change-Id: I998b86ec12d531cf1db08db7d9c23d12d8641730
Fix heads up action bar switch handling for tablets.

Similar to commit 91f47b9f55467f1c8de4c6c732375d9f6f3c3942.

Change-Id: Ia4c5e8169ccd6786d2284eccec30397cac48d218
Settings: Make settings searchable.

Signed-off-by: Adnan Begovic <adnan@cyngn.com>
Signed-off-by: Danesh Mondegarian <danesh@cyngn.com>
Change-Id: Ic06dca33bf8fd0ef8f63f51e131b70fe730cb7c5

Conflicts:

	AndroidManifest.xml
	res/values/attrs.xml
	res/xml/notification_drawer.xml
	res/xml/settings_headers.xml
	src/com/android/settings/Settings.java