Custom clear recents button (2/2)
- Option to show/hide
- Option to choose which corner to place (top left, top right, bottom left, bottom right)

Thanks omnirom team
Original commit: https://github.com/omnirom/android_packages_apps_OmniGears/commit/89818412841d558057c2b906bc3fd78f3c9adf13

Change-Id: I740c26906527e7300e962129f3435b5b90b6b721

Conflicts:
	res/xml/system_ui_settings.xml

Conflicts:
	res/values/cr_arrays.xml
	res/values/cr_strings.xml