Wlplan

New functionality and bug fixes

- Python interface for constructing Domain and Problem objects from PDDL files directly (unforunately, the c++ interface does not exist yet)
- Fix memory leak due to unseen init colours
- Fix CMakeLists.txt file for c++ package
- No longer raise an exception when a constant object exists in the PDDL problem file

Remove numpy depedency

New functionality added to `WLFeatures`
- Save and load files in json format
- Set and get linear weights
- Predict heuristic directly when linear weights are set

Same source code as v0.2.2 but better documentation formatting

Same source code as v0.2.1 but now use GitHub workflows to generate and include stub files in the package

Same source code as v0.2.0 but now use GitHub workflows to publish packages to PyPI