Work lost when saving an animated vox file

[THJSmith]

Hello!

I realise this is my own mistake. But it seems like one where some UX changes could give a better experience for new users.

Repro steps:

1. Create a new file, make a model
2. Add some animation keyframes.
3. Make some changes to a keyframe.
4. Save
5. Re-open the file.

Expected results
The changes made in step 3 would be saved to the currently active keyframe (or create a new one) or just not lost.

Actual results
Changes will be lost.

Alternative solutions
When clicking save and changes haven't been applied to a keyframe, show a warning.

Hope this is clear.