libmediaplayerservice: Add new player for DASH

- Add new player factory to support dash playback.
- DASH urls end with .mpd. When media player receives
  an url with .mpd, it will use new factory to instantiate the player
  to be used for supporting DASH playback.

Change-Id: I69e5a08fb2baf89d97b1e0711dbe52a8b1c39c29
libstagefright: Fix incorrectness nPortIndex value for QueryCodec
                The query index is wrong, it will make a death loop in
my ME722 when get resource thumbnail for MPEG4 video.

Change-Id: I64532156e762b847a8eae59560fb828549c29519
MediaScanner: Ignore dirs with .noscanandnomtp

Completely ignore directories with .noscanandnomtp files
in them. Placing a .nomedia file will still scan a
directory but exclude it from the media database. This
is so the file may still be presented for MTP purposes.

Placing .noscanandnomtp completely prevents the scan,
which saves considerable processing power and battery
life on systems with numerous media files, but prevents
them from being seen over MTP.

Change-Id: Ibff2a9f2525255a2ac34132eeee36734962fbdd7
Silence error when DASH player isn't present

Change-Id: I9e5c22af1a5cf916b0efaec7ca1c5f48f6d0c82a