add function for finding track object by ref data

This is the start of a project to let two (or more) instances of mtui
link together and host a party where tracks are accessed on each user's
own machine. Backends will be linked so that any actions taken in one
will be reflected in another. This function is a key part of
implementing this, since mtui depends on all instances of a track be
referred to by the same JS object, and the new function allows the
(approximate) identity of a track to be serialized and transferred over
the internet (or any static format) and restored later, on another
device, and/or even in a differently structured music library.

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