Seek, repeat, and shuffle control for Spop

command/index.php
* Add cases to handle seek, repeat, and shuffle commands
* Guarantee sockets disconnect by end of script

db/index.php
* Guarantee sockets disconnect by end of script

inc/player_lib.php
* Deal with Spop status data for seek, repeat, shuffle, playlist position

js/volumio.api.js
* Connect timer control with whichever daemon is active
* Remove refreshState function, use the dynamically defined 'objectInputState' instead of 'MpdState'

js/volumio.playback.js
* Add Spop seek command support