Update for app framework removal.

Update for app framework removal.

Changes:
- Remove the autobuild scripts and config.xml used by the app
  framework widget build.
- Update the qmake files to just build a "videoplayer" binary and
  install it into /usr/bin by default.
- Remove the code in main.cpp that handled reading the WebSocket
  command-line arguments and passing them to binding related
  code.
- Add setenv of QT_QUICK_CONTROLS_STYLE to "AGL" to get the AGL
  styling used.  This replaces a global environment variable
  definition tied to the old app framework, and makes it more
  obvious that the style is required for the app to properly
  work.
- Remove MediaScaner based on QtWebSockets which was removed
  from agl-demo-platform

Bug-AGL: SPEC-4182
Change-Id: I022217ffc42da41093a55120554237f95e3aa413
Signed-off-by: Vasyl Vavrychuk <vasyl.vavrychuk@opensynergy.com>