Better error messages instead of parse errors

[m-yac]

In general, the parser should be more lenient, so that the user sees less parse errors and instead more human-readable errors and/or more "Did you mean" messages. For example:

1. Hyphenation should be allowed anywhere in a verbose color prefix, with "Did you mean" text when it's non canonical. See: feature request: use "co-" prefix to avoid huge degrees in color names microtonal-utils#5 (comment)
2. Trying to combine additive and multiplicative expressions shouldn't give a parse error, it should give a more helpful and readable error. Same with trying to add/multiply/etc. two notes.

This would involve significantly rewriting the parser to make it more lenient, and replacing eval.js with something more robust to enable it to inspect the output of the parser in more detail.

[m-yac]

(1) is done in m-yac/microtonal-utils@e9ffc30 and 702dc15.