[HowTo] Setup a spotify-connect-web-server on a Raspberry Pi with OSMC

@zatarra and @Pezzy thx for the useful hints and service file.
I tried it on vero2. There’s also a fix for volume control and other things:
https://github.com/Fornoth/spotify-connect-web/archive/master.zip
With this fix it doesn’t work for me I get a message about some flask module missing.
Without the fix I get:
SpInit: 0 Traceback (most recent call last): File "main.py", line 27, in <module> connect_app = Connect(web_error_callback) File "/usr/src/app/connect.py", line 75, in __init__ lib.SpPlaybackUpdateVolume(mixer_volume) OverflowError: can't convert negative number to unsigned

For a workaround on the volumio forum it is advised to change

mixer_volume = int(mixer.getvolume()[0] * 655.35)
into:
mixer_volume = 1 #int(mixer.getvolume()[0] * 655.35)

I don’t know if that affects the ability to control the volume via spotify app.
Because this doesn’t work for me. No big deal.

But what bothers me, is that if I start it at boot now the audio output of kodi when playing movies, streams and so on stopped working.
If I stop the service everything works again. This is annoying because it basically makes such service file which automatically starts useless.
Maybe someone has a hint to resolve this.