Themes: Add method to "apply all" a theme

Change-Id: Ic8feaeade6c52707e6b5b17921b1b577b94ec8cf
Themes: Add URI for querying previews of applied components.

Change-Id: I97417901f3b03fc82df5a823970991ddd8092df2
quiethours: do not play screenshot sound

If we are in quiet hours do not play any sound when we take a screenshot.

Change-Id: Ideaa5c11611b7e3c9d6ca4d27e801cd2fb4eadac
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>