Remove unused methods

plugins/moc.py

         self.title = "(unknown)"
         self.td = TrackData()
 
-    def read_data(self):
-        self.td.load()
-
-    def mocp_running(self):
-        cmd = 'ps -eo comm | grep -q mocp'
-        return subprocess.call(cmd, shell=True) == 0
-
     def assemble_title(self):
         """Assemble the data to human-readable format"""
         d = self.td