Configurable API version

[inputsh]

So, I see that the BASE_URL is hardcoded to http://{0}:1925/5/{1}.

My specific TV (43PUS6262) doesn't seem to respond to /5/, but /6/:

$ wget http://<IP>:1925/5/audio/volume
--2019-10-14 16:04:24--  http://<IP>:1925/5/audio/volume
Connecting to <IP>:1925... connected.
HTTP request sent, awaiting response... 403 Forbidden
2019-10-14 16:04:24 ERROR 403: Forbidden.

$ wget http://<IP>:1925/6/audio/volume
--2019-10-14 16:04:27--  http://<IP>:1925/6/audio/volume
Connecting to <IP>:1925... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [application/json]
Saving to: ‘volume’

volume                                [ <=>            ]      58  --.-KB/s    in 0s      

2019-10-14 16:04:27 (730 KB/s) - ‘volume’ saved [58]

This makes me think that the API version should really be configurable from configuration.yaml, with /5/ possibly being a default value?