Add "Save .npy" button to Gameworks GUI with file-picker and save history

[SevWren]

Feature Request:

Add a "Save .npy" button to the Gameworks GUI. When pressed, this button should open a file explorer GUI (file-picker) that allows the user to:

• Choose the location to save the file
• Choose the filename

Requirements:

• The user must not be able to change the file extension; the saved file must end with .npy.
• If the user enters a filename containing a ., the final saved file should always have the .npy extension (e.g., something.test -> something.test.npy).

Supplementary Feature:

• Keep a history of the boards that each user has saved using the Save feature. This could be referenced in the UI or logs as needed to improve user experience.

Acceptance Criteria:

• Save button opens a file dialog.
• File dialog enforces the .npy extension on all saved files.
• History of saved boards is maintained per user.

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Please implement this feature to enhance the usability and data management capabilities of Gameworks.