Pygame-gridcalculator

This is v2.1.0 of the pygame-gridcalculator. This change is designed to ensure compatibility with the most recent versions of Python (3.12) and pygame (2.6) at the time of publishing, and to encourage any users of this project to ensure their Python and pygame instances are as up-to-date as possible.

_NOTE: There is no actual functional changes to the code as part of this release, and as we do not expect this to be a directly breaking change (as we have compatibility testing with Python 3.10 and 3.11) it is being released as a minor update._

This is v2.0.0 of the pygame-gridcalculator. This introduces the following additional functionality:

- Ability to create a ShapeFactory and generate/draw pygame shapes using GridCalculator points.
- Ability to use partial grid points.
- Ability to amend the grid after initialization.
- Ability to draw the grid directly to a pygame.Surface for diagnostic purposes.
- Ability to define the grid starting/ending points to allow for grid-in-grid usage.

The initial release of pygame-gridcalculator.