Cff2toml

Changes
- Refactored code to use pydash to dynamically get and set data to metadata objects.
- Added many new methods, someof which are not yet described or used in the README
- Updated the README with subsections for the usage and updated the code examples.
- Reorganized modules and changed the parameter order of some methods.

Changes
- Fixed default parameters for the function: set_version_for_pyproject_toml_and_citation_cff()

Changes
- Fixed default parameters and tests for getting the versions from pyproject.toml and CITATION.cff.

Changes
- Fixed default file paths for pyproject.toml and CITATION.cff

Changes
- Fixed pytest configuration and tests so that they can import the package without refering to src.
- Third attempt at fixing module loading problem by removing src as part of the package path.

Changes
- Second attempt at fixing import bug.
- Added function get the version of the pyproject.toml file: get_version_for_pyproject_toml()
- Added function get the version of the CITATION.cff file: get_version_for_citation_cff()