Dhruvkhanna/code cleanup

[dhruvkhanna38]

Merging branches

• https://github.com/make4all/psst/tree/noramorsi/keyboard
• https://github.com/make4all/psst/tree/origin/jen-architecting
  to main

[venkateshpotluri]

Please perform the following tests before we merge. Possible include these as test cases that could run as a part of the CI/CD pipeline.

• check the keyboard demo on the dashboard.
• in a separate code file, try chaining handelers and test if those work. e.g. a filter range handeler with a sound effect.
• test handeler-output combinations using the dashboard to ensure nothing breaks.

[dhruvkhanna38]

@venkateshpotluri the tests above are working for this pull request. It is good to merge.

I removed some deprecated code and updated the comments for some of the classes.