Ampache API

* security
	* Add setting for admin to enable/disable Ampache API for the whole instance
	* Add setting for user to enable/disable Ampache API for this account
* new DB tables:
	* ampache_user_status - enabled users
	* ampache_sessions - session tokens
	* ampache_users - hashed passwords of users
* Ampache API (ADD and UPDATE parameters are unsupported yet)qq:
	* handshake
	* ping
	* artists
	* artist_albums
	* album_songs
	* albums
	* artist_songs
	* songs
	* song
	* search_song
* Middleware to authenticate user with ampache token