Misty2py

Added

- `misty2py.basic_skills` with useful basic skills: `cancel_skills`, `expression`, `free_memory`, `movement` and `speak`
- added several utility functions to `misty2py.utils`, including `misty2py.utils.status` to track the execution status of skills and path and message manipulating functions

Changed

- fixed missing type hinting
- black formatting

Added

- additional unit tests for the `utils.utils` sub-package
- `pytest-cov` for measuring the test coverage

Changed

- `README.md` now contains clearer instructions on running the tests and obtaining the test coverage report

Changed

- `misty2py.utils.env_loader` now contains optional parameter `env_path` for custom path to the environmental values

Added

- a pytest for custom `env_path` for `env_loader`

Removed

- the sub-package `skills` -> this will become a separate package due to different dependencies which basic `misty2py` does not use
- the dependencies that are no longer needed
- documentation concerning `skills` sub-package
- `misty2py.utils.status` module removed as it is only used in the `skills` subpackage

Added

- new skills `remote_control`, `explore` and `face_recognition`
- new utility module `status` to track the execution status of a script

Changed

- renamed `misty2py/skills/greeting.py` to `misty2py/skills/hey_misty.py`

Changed

- fixed style mistakes in documentation