Add a device driver

Draft outline

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Add support for a new camera, laser/LED, or positioner.

• The manager pattern: what interface a new device implements.
• Registering the device in the configuration JSON.
• Testing against the virtual device first.
• Example: walk through adding one device type end to end.

TODO

Source: ImSwitch_Functionality_Overview.md ("Extensibility", supported device types: ESP32, virtual, Cobolt, CoolLED, SQUID, etc.). Reference: config JSON.