Concurrent track loading

[ShizukanaYaseotoko]

Enhancement Summary

It seem like currently tracks are loaded one by one when opening a project. This is a problem if, for example, one has a project with 8 tracks all with instances of a plugin which takes a few seconds to load. If it could be parallelized, it could greatly improve the project loading times.

Implementation Details / Mockup

Possibly starting up to half the number of cores in the CPU threads for loading the tracks?

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