Feature: Generate speech at runtime - multiple voice support

[earboxer]

Currently, the audio in this skill is hard-coded.

Mycroft Mark II claims

Custom voices: You can choose the voice of your Mycroft, currently we support American Female and British Male voices with more coming soon.

To support these voices, this skill will either explode with more files, or need the text coded in and audio generated at runtime.

I suggest the latter.

[earboxer]

Based on performance issues with mimic, (MycroftAI/mimic1#155 MycroftAI/mimic1#77), it seems like the best option is to create audio files of the voice, then combine them with the backing track using something like pydub.

[penrods]

These songs were hand-created by various users in audio editing software. I'm happy to pull in more songs if others want to create some, but at this point I don't expect Mimic or Mimic2 to be able to generate properly timed music without someone spending a lot of time on it. I can imaging using some of the karaoke tracking software to pull something off, but this isn't something the core team is going to exert effort on.