New input layer

[tsmbland]

Description

Development branch for the new input layer. Very far from being finished, but opening this up as a PR just to make it easier to keep up to date with develop

Fixes # (issue)

Type of change

Please add a line in the relevant section of
CHANGELOG.md to
document the change (include PR #) - note reverse order of PR #s.

• New feature (non-breaking change which adds functionality)
• Optimization (non-breaking, back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (whatever its nature)

Key checklist

• All tests pass: $ python -m pytest
• The documentation builds and looks OK: $ python -m sphinx -b html docs docs/build

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.30%. Comparing base (0f1f518) to head (f5bec10).

Files	Patch %	Lines
src/muse/examples.py	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #397      +/-   ##
===========================================
+ Coverage    71.28%   71.30%   +0.02%     
===========================================
  Files           44       44              
  Lines         5885     5890       +5     
  Branches      1154     1155       +1     
===========================================
+ Hits          4195     4200       +5     
  Misses        1369     1369              
  Partials       321      321              

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