Add "Save as Copy" option to versions

[chrischrischris]

Allows for user to save the version as a copy. Saves to the same folder with the version name appended to the filename.

Some outstanding issues:

• How should save confirmation appear? Currently uses an alert.
• Should user have option to name the file before save?
• Should the date of the version be included? I have plumbing for it but am not using at the moment.

Fixes #239

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Commits

• 8c39d67 ✅ (latest)
• 1e37df4 ✅