[BLUEJ-1285] Restore Raspberry Pi GPIO functionality

At a point where BlueJ wasn't working on Raspberry Pi, we removed the functionality for using the GPIO ports: we removed the wiringpi library, the preferences pane, and the ability to launch as sudo.

Now that Raspberry Pi is working again (via OpenJFX) we should restore this functionality.

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Issue metadata

• Issue type: Bug
• Priority: Medium