Implement Syncback to support converting Roblox files to a Rojo project #1829

Job	Run time
Check MSRV	57s
Rustfmt, Clippy, Stylua, & Selene	1m 9s
Build and Test (ubuntu-latest)	1m 11s
Build and Test (windows-latest)	3m 48s
Build and Test (macos-latest)	1m 42s
	8m 47s

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