[add] status and queue_get without publishing, usefull for updating
[add] ask for updates without publishing
[add] restore periodical status update to check if player dies and get tag updates

there is no callback when tags finish loading, so if tags are loaded and nothing else happens, playlist will appear as 'loading' until somebody executes a command that triggers a publish. now the browser will check every 5s.
[fix] rename error message from server to player to indicate the correct issue

player is issued for python gst player, and server for the django web server
[add] function to check for websocket connectivity status
[add] cleanup ws when window is closed
[fix] template processors configuration