Added Incremental Saving

[Azagwen]

This PR adds incremental saving, similar to what can be seen in Blender and Autodesk Maya.

electron_C324kLsoPc.mp4

This would be useful to keep past versions of a given project file, without having to set up boilerplate version control tools like Git.

Would close #2360

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[Azagwen]

At the moment this uses RegEx to isolate and add to the file name before .bbmodel, let me know if I should try another maybe more reliable or proper way

[Azagwen]

an issue I found with the current ways this works; re-saving incrementally from a previous version overwrites versions above it
I could fix this by either:

• changing it so that the version nb is based on the date & hour instead of a flat integer
• checking if a file named the same exists in this spot, and saving a "bis" version if it does exist

Let me know your thoughts!

[Azagwen]

another thing; this doesn't seem to work on the web version, since there is no project path when editing in a web browser