When the Maze Solver was idle the wait_for_close() loop ran which
continuously redrew the window in an infinite while loop. This caused
the CPU usage to spike between 70%-80%. This commit removes that method
and uses the _root.mainloop() instead to keep the window visible on the
screen. With this the CPU usage has dropped to > 1% when idle.
Main feature:
- Added functionality to randomly generate a maze before the solver
solves it.
Fixes:
- Add a public method in the Cell class called wall_exists() that
returns true if a given cell wall exists (false otherwise).
Refactors:
- Added an enum type called CellWallLabel for labelling the four cell
walls.
- Added a draw() function in the CellWall class to reduce repeated code.
- Move the custom exceptions to errors.py
Tests:
- Add tests for the custom exceptions.
CI:
- Added a workflow for Forgejo Actions.
- Add an entrance and exit to the maze. The entrance will always
be on the top left and the exit will always be on the bottom
right.
- Add a simple GitHub actions workflow to run the Python tests.
