Removed all ReplayGain and Silan stuff from pypo, plus a bugfix

* Ripped out all the ReplayGain and Silan analysis from pypo, since
  it's now implemented in airtime_analyzer. This fixes a bunch of
  race conditions.
* Also renamed the replaygain field to replay_gain in airtime_analyzer
  to match Airtime.

python_apps/pypo/pypocli.py

@@ -27,9 +27,6 @@ from pypomessagehandler import PypoMessageHandler
 from pypoliquidsoap import PypoLiquidsoap
 from timeout import ls_timeout
 
-from media.update.replaygainupdater import ReplayGainUpdater
-from media.update.silananalyzer import SilanAnalyzer
-
 from configobj import ConfigObj
 
 # custom imports
@@ -250,10 +247,6 @@ if __name__ == '__main__':
         g.test_api()
         sys.exit(0)
 
-
-    ReplayGainUpdater.start_reply_gain(api_client)
-    SilanAnalyzer.start_silan(api_client, logger)
-
     pypoFetch_q = Queue()
     recorder_q = Queue()
     pypoPush_q = Queue()