Add open, inv and drop function

[thgrund]

I would like to discuss these three new functions. I wanted to use inversions and drop chords independently from the chord notation in the mini notation and came up with this solution.

My motivation comes from my system where I create harmonies and melodies in a totally different approach then we usually do in TidalCycles: https://github.com/thgrund/mrreason-setup/blob/main/README.md

But I think these functions (open, drop and inv) could be useful in general.

[thgrund]

And I realize that I need to change the name of the functions because of ambiguity

[sss-create]

And I realize that I need to change the name of the functions because of ambiguity

@thgrund, had a only quick look. what are the ambiguities?
n.b.: I didn't know there are no chord inversion functions -- great addition!
What else is there to do, except resolving conflicts?

[thgrund]

Oh! I forgot, that this MR exists xD Thanks @sss-create for mentioning it. The ambiguity is, that there is already a Prelude.drop function and in TidalCycles the function inv already exists in Sound.Tidal.UI.
And then we need to add unit tests for this. I already did this locally (I append theses tests to that comment).

If you have the capacity to resolve the conflicts, and to rename the functions + adding the unit tests, then I would really appreciate it :-)

Unfortunately I do have limited capacities right now.

ChordsFuncTests.md