Colonyscanalyser

Added
- Colony colour identification and grouping
- Webcolors package and rgb_to_name function to provide CSS colour groupings
Fixed
- crop_image will now correctly handle images without an alpha channel

Added
- Documentation
- Published documentation to GitHub pages (https://erik-white.github.io/ColonyScanalyser/)
- Unit tests for the colony module

Fixed
- Adjust setup to correctly find packages in implicit namespaces

Added
- Added changelog
Changed
- Update package to use src structure
- Update setup for readme compatability with PyPi

Added
- GitHub action for automatically linting and testing pushes
- GitHub action for building and releasing package to PyPi
Fixed
- Linting errors highlighted by flake8

Added
- Graceful exit if no colonies are found
- Workaround function to ensure correct plates are found in images
Changed
- Improve Timepoint grouping by using distance comparison instead of rounding
- Updated Scikit-image to v0.16
Removed
- Depreciated Tk import
- Removed depreciated regionprop coordinates