Add global reboot option

Add global reboot option when long press power key and confirmation dialog
when user chooses to reboot device.

Conflicts:
	core/res/res/values/strings.xml
	core/res/res/values/symbols.xml
Revert "Add clear all recents action to recents panel"

This reverts commit 92ea2c0c6fad3899dd6363056c5a046c47c8c54a.
Add clear all recents action to recents panel

Change-Id: I2243ebc83abc483e78b112900a653d7e61edc5ba