Display Settings: Better font size control

Use a SeekBar instead of a list/spinner to determine the font scaling.
For consistency, an approximate size (small, normal, etc.)
 and the exact percentage are displayed.

Change-Id: I96f80d93e740a25a6a6890b423a41c3900b93767

Conflicts:
	res/values/attrs.xml
	src/com/android/settings/DisplaySettings.java
settings: Add fastboot toggle

 * Add a toggle in performance settings to toggle fastboot.

Change-Id: I54bc14f188766e72723212a08a4c65c273d612c2

Conflicts:
	res/values/strings.xml
	src/com/android/settings/cyanogenmod/PerformanceSettings.java