Data from Files

[thombruce]

closes #70

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Internal use. Do not delete.

• [ ] Tests passing
• [ ] Coverage sufficient
• [ ] Manual review
• [ ] No A11y regression
• [ ] Translations provided or not needed

[thombruce]

Loading from file covered. What about saving to file?

We want some mechanism to adjust and save new config values, but this is probably better covered as part of #34.

We would also like to see constants moved here. Things like physics and distance scaling values.

We would also like to see ships and known planets/planetary-systems using the load-from-file strategy.

Plenty more that could be done here right now... if we want to.