DocumentsUI: Allow open files instead of URIs

Check files' real path and mime type to open them only in standalone mode.
This allows, for example, installing apks.

Change-Id: I4501c694db84b8595cd3928752254a8914539972
frameworks: add Voice Wakeup system icon

Change-Id: Ifccedfc9d52d27185c1ecd6e922a0465c987be5c
Signed-off-by: Roman Birg <roman@cyngn.com>