Interface preparation for Plex support
Refactoring: renamed XbmcServer class to MediaServer class
Added media player type to database model
Description change for media library
Show media player type in server menu
Saving and loading server type added
Added server_type function
Error message shows media server type
Error messages changed for Plex support
Revert "Refactoring: renamed XbmcServer class to MediaServer class"

This reverts commit 4f01568b124ee00923f75dda83e8c5da317656d2.
first steps on Plex library
Renamed xbmc_notify to notify to prepare for other players like Plex
removed xbmc_notify_dialog.html
Added missing __init for plex library
Replace xbmc with media player in comments
Added ElementTree as library to plexclient for reading XML
Added getclient to plexclient
Added small demo program to plexclient library
Added parameters for movie library and tv library to class initialization
Added getrecentlyaddedepisodes to plea library