Saving and restoring window size and position

[Milincho]

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Problem Description

Ferdium does not save and restore the window size and position set by the user.

Proposed Solution

Saving window size and position when Ferdium is closed and restoring it when it is loaded again.

Alternatives Considered

None

Additional Information

No response