Version 1.6
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* Initial public version. 
* Implements the API via REST.
* Implements the controls for switching the inputs.
* Implements the controls for volume und mute.
* Implements an input decoder for AC3 and DCA. Status controls are included.
* Implements a signal generator. You can use it to test if your speakers are correctly connected.
* Implements a phase inverter for the output.
* Implements controls to change the channel layout for the output.
* The settings of the ALSA controls a saved at program start and restored at program stop.
* The settings of all controls are stored after change. These stored settings are loaded at the next program start.
* Changes on controls are notified over a WebSocket.    