Camera2: Improve shutter button

-Fix shutter button location
-Use smaller drawables

Before - http://goo.gl/4iCocE
After  - http://goo.gl/i63k8C

Change-Id: Id51fba53372bc7f67750e82063bfa7e1479ea503
Merge "Camera2: Improve shutter button" into cm-11.0
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_packages_apps_Camera2 into cm-11.0

Conflicts:
	res/drawable-hdpi-v19/btn_shutter_default.png
	res/drawable-hdpi-v19/btn_shutter_pressed.png
	res/drawable-hdpi-v19/btn_shutter_recording.png
	res/drawable-hdpi/btn_shutter_default.png
	res/drawable-mdpi-v19/btn_shutter_default.png
	res/drawable-mdpi-v19/btn_shutter_pressed.png
	res/drawable-mdpi-v19/btn_shutter_recording.png
	res/drawable-mdpi/btn_shutter_default.png
	res/drawable-sw600dp-hdpi-v19/btn_shutter_default.png
	res/drawable-sw600dp-hdpi/btn_shutter_default.png
	res/drawable-sw600dp-mdpi-v19/btn_shutter_default.png
	res/drawable-sw600dp-mdpi/btn_shutter_default.png
	res/drawable-sw600dp-xhdpi-v19/btn_shutter_default.png
	res/drawable-sw600dp-xhdpi/btn_shutter_default.png
	res/drawable-sw600dp-xxhdpi-v19/btn_shutter_default.png
	res/drawable-sw600dp-xxhdpi/btn_shutter_default.png
	res/drawable-xhdpi-v19/btn_shutter_default.png
	res/drawable-xhdpi-v19/btn_shutter_pressed.png
	res/drawable-xhdpi-v19/btn_shutter_recording.png
	res/drawable-xhdpi/btn_shutter_default.png
	res/drawable-xxhdpi-v19/btn_shutter_default.png
	res/drawable-xxhdpi-v19/btn_shutter_pressed.png
	res/drawable-xxhdpi-v19/btn_shutter_recording.png