Tutorials cleanup

[agmoore4]

Description

This release makes updates to the text module tutorials and docstrings, as well as some miscellaneous non-breaking changes
to associated text module functions.

Functionality

• All functions in the submodule pvops.text.visualize now accept an optional ax keyword argument, allowing the user to pass a matplotlib Axes instance.
• All functions in the submodule pvops.text.visualize now return a matplotlib Figure instance (previously, some incorrectly returned Axes instances).

Tutorials

• Some tutorials have been renamed to better clarify their contents. All tutorial names now follow the format: tutorial_{MODULE}_{FUNCTIONALITY}.ipynb.
• Previously, text module tutorials called functions from an additional Python script. All of these functions have been pulled into the tutorials proper.
• Text tutorials have been numbered in a logical progression.
• Text tutorials have had their contents fleshed out, in particular more descriptive markdown sections describing the functionality being demonstrated.

Documentation

• Docstrings were fixed for some functions that were improperly formatted.
• Docstrings were updated for pvops.text.visualize functions' new ax argument.
• Version number increased to 0.7.0. "What's new" page updated.

Other

• Minor changes to plotting functions in the submodule pvops.text.visualize related to text size and other miscellaneous aspects of figures.
• Changing Python testing and linting versions to 3.9 through 3.12 (previously 3.8 through 3.11). Python 3.8 has reached end-of-life, while 3.12 is the latest supported by all dependencies.
• Building docs in most recent compatible Python version (3.12) instead of previous 3.11.