android: copy notice & license into assets (for apk)

Change-Id: Ic2289d5ca96d06352c853d7803938a12aa204e73
android: add library for text filter (to read text files)

Change-Id: Ie63f058463e681b0b4adedc5f0cbc5b0a703601a
android: about dialog in properties

Change-Id: I82961efee6415f07248c79062f2b3b8c58266821