Year in music and a whole pile of other general development

[mayhem]

This PR is too large and I apologize for that. It originally started off for the 2020 year in review work, but then languished until now. And in creating the playlist for this years year review, I needed to create many more elements in order to get the job accomplished.

Some of the work in this PR:

• Create top discoveries patch
• Create top recordings patch
• Create top missed recordings
• Add BPM lookup element
• Add Mood lookup element
• Add playlist shaper that orders a playlist by BPM, from low to high to low again.
• Add a playlist shuffle element
• Add a playlist redundancy reducer element
• Add a playlist duplicate reducer that removes duplicates based on artist/track name for use with Annoy
• Add type checking of the pipeline so that input/output mismatching pipelines cannot be created.
• Add command line support to override playlist name/desc
• Add a patch to read a file with MBIDs and make a playlist from them.

This PR does not address tests -- that will come in the next version. But lets aim to merge this ASAP so that it does not continue to get bigger.

[amCap1712]

Few comments. otherwise LGTM. More docs and test will also help but we already decided to do that in follow up PR so that is fine.

[github-actions]

Unit Test Results

  1 files  ±0    1 suites  ±0   0s ⏱️ ±0s
36 tests ±0  32 ✔️ ±0  0 💤 ±0  4 ❌ ±0 

For more details on these failures, see this check.

Results for commit a50d2e2. ± Comparison against base commit a50d2e2.