Support Game Save/Load System

[Phillyclause89]

Title:

Support Game Save/Load System

Description:

Support Game Save/Load System

Scope of Work:

• TODO comment 'TODO: Prompt user to start a new (or load an incomplete) game.'
• TODO comment 'TODO Add save game method call here.'
• TODO comment 'TODO: Check self.engines.board.outcome here and activate some endgame debrief flow if game-over'
• TODO comment 'TODO: Check self.engines.board.outcome here again and activate some endgame debrief flow if game-ove...'
• TODO comment 'TODO: Add autosave point here (or via self.after) once save system is developed'

Acceptance Criteria:

• Completed games autosave to a new .pgn file.
• In-progress games autosave upon game exit.
• In-progress games can be loaded upon game start.

Additional Context (Optional):

• main.py

[Phillyclause89]

Punting this back to Future #48 is the priority right now.