Proposal: Vendor mobx-state-tree #4938
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This PR proposes 'vendoring' mobx-state-tree
The mobx-state-tree repo down-transpiles to es5 classes which are slower, and we can make things somewhat faster as a result of doing less transpiling
As an example, it has the nice effect of a 2x speed improvement on importing (8 seconds -> 3.7s with about 2,000 tracks). The full proper speedup for large tracklists may still be the 'frozen tracks' branch, but this PR is helpful in that regard