Worked on plex-reporter.py.

plex-reporter.py
- fixed imports
- now detects even more methods of playback
- currently detects:
   - ios/plex.app playback
   - browser/web playback
   - Plex Media Center(windows/mac) playback
      - initial support, not information provided by logs
- events now have a hopefully unique id called "event_id"
- removed bits that are no longer relevant
- we now are interested in '/:/progress' events
- EventParser objects now collect the lines that matter
  and can be used for debugging.
- added some sanity checks...