Downloading URLs via "voice" doesn't work

[Nold360]

I'm trying to install a custom voice model.
First i tried installing it locally, but piper still couldn't find then.

So I uploaded it here: https://github.com/Nold360/piper-voice-glados/releases/download/0.1/voice-en-us-glados-high.tar.gz

Inserted the URL in mycroft.conf as "voice", which gives me:

ValueError: invalid voice: https://github.com/Nold360/piper-voice-glados/releases/download/0.1/voice-en-us-glados-high.tar.gz 

[builderjer]

I think this was mentioned in the matrix chats also. From my experience, if you add the voice and url to this function, you can use the name as a value in "voice" and it will auto download the model.

PR's are welcome

[dblencowe]

I'm working on a refactor of the init function here that should allow for fetching of onnx / .gz files that aren't on the model list, I just need to test it