Veld

* Features
- Add frequency command
- Add modulo command
- Add pass-through command
- Add product command
- Add summary command
- Add basic math operators
- Add support for non-numeric values in some commands
- Support non-numeric values in barcount
* Fixes
- Checkout code in build action
- Make test dir importable
- Quotation marks in release workflow
- Use urls without variables
* Testing
- Rewrite cumsum test
- Add unit tests for trimmed mean
* Documentation
- Minor documentation and testing updates
* Build
- Explicitly specify numpy dependency
- Various changes to release script
* Continuous Integration
- Add release workflow with trusted publishers
- Updates to release script
- Take release notes from tag
- Various improvements to release script
* Code style
- Code formatting
- Update linters

* Features
- Add paired t-test command
* Testing
- Add missing main for cumsum unittest
- Remove unnecessary unlinks
* Documentation
- Format command list by group in manpage
- Minor readme updates
- Add additional documentation to veld man page
- Add badges to readme
- Add chaining example to readme
* Build
- Add commitizen pre-commit configuration
- Automate some steps of the release process
* Code style
- Simplify comparison operator implementation
- Use hyphen for multi-word commands

* Add round command
* Add line plot command

* Added numerous commands
* Added unit tests

* Initial release