Add ability to auto-regen unity assets

Add two buttons: start auto re-generation of Unity assets, and stop.
These start/stop a thread which periodically (every 3 seconds) hashes
the user-provided animator, menu and parameters. When any one of these
change, it invokes the function to generate Unity assets.

The hash is non-cryptographic, so it's light. The only hit is that we
have to read the entire file contents every few seconds, and compute a
sum across that entire memory region. This is extremely light unless
you're on a spinning platter hard drive with a small cache.

Still seeing the bug where the material drops ref to the font bitmaps.
Probably need to update the .mat using the guids in the bitmap .meta
files.

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