Configurable screenshot toggle long press action

- 2 seconds
- 5 seconds
- 10 seconds
- 20 seconds

Default speed is still 5 seconds

Change-Id: I64f5f78acefa37e6613f637fda7d32632bd9482d

Conflicts:
	res/values/custom_strings.xml
	res/xml/quick_settings.xml
	src/com/android/settings/du/QuickSettings.java
Use actual storage type of sdcard/usb (2/2).

Currently, storage volume description for mount/unmount/format determined at
build time using PRODUCT_CHARACTERISTICS. For device which has only a sdcard or
only support usb storage, displayed description is correct. For device which has
both storage, the displayed description is totally wrong.

Use of actual storage type at runtime can eliminate the needed to specify
product characteristics, either default or nosdcard.

Change-Id: I9f8d53a4648d960f1009b1fe94787eecd4343427

Conflicts:
	res/values/cm_strings.xml
	src/com/android/settings/deviceinfo/StorageVolumePreferenceCategory.java