Settings: Use a seekbar preference to allow setting arbitrary animation scale values

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>

Conflicts:
	res/values/ids.xml
	res/values/simpleaosp_strings.xml
	src/com/android/settings/DevelopmentSettings.java

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>

Conflicts:
	res/layout/preference_dialog_fontsize.xml
	res/values/strings.xml
	src/com/android/settings/IntervalSeekBar.java