[WIP] Add import/export option for joystick configuration

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Feature Request: Import/Export option for joystick configuration; simpler enable options</issue_title>
<issue_description>Would like the capability to "export" a USB hand controller configuration (currently called a Joystick within MP) to a single file that could be more easily distributed to other users and imported into their MP install with a single click (within the Joystick configuration window).

Would also benefit from "Enable Joystick" option existing on main page without needing to launch the configuration window each time (assuming that joystick has already been configured). Alternatively could be an Auto-Enable option if a given joystick device is present and detected by MP upon launch.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Feature Request: Import/Export option for joystick configuration; simpler enable options #3615

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.