Introduce 5/8 Meter

[wbaldoumas]

Description

Introduce 5/8 meter.

Also bugfix instrument randomization which ran into index out of bounds issues previously.

Type of Change

• Bug Fix
• New Feature
• Breaking Change
• Refactor
• Documentation
• Other (please describe)

Checklist

• I have read the contributing guidelines
• Existing issues have been referenced (where applicable)
• I have verified this change is not present in other open pull requests
• Functionality is documented
• All code style checks pass
• New code contribution is covered by automated tests
• All new and existing tests pass

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.17%. Comparing base (6fe88b0) to head (5bf6102).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #193      +/-   ##
==========================================
- Coverage   97.24%   97.17%   -0.07%     
==========================================
  Files         164      164              
  Lines        3777     3828      +51     
  Branches      396      439      +43     
==========================================
+ Hits         3673     3720      +47     
- Misses         81       84       +3     
- Partials       23       24       +1     

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