[NEW SKETCH]: 4A4A2-EXT_LIGHTS_PANEL.ino

Description

New sketch for the external lights panel.

Closes #45

List any dependencies that are required for this change, including a full list of libraries required, especially if it is a new or otherwise unused library in the OpenHornet software.

[x] New software module (new software module for slave)
[ ] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] This change requires a documentation update outside of the automatically-generated Doxygen documentation.

[x] My code follows the style guidelines of this project
[x] I have complied with the software manual for this project
[x] I have performed a self-review of my own code
[x] I have commented my code fully with Doxygen compatible comments, particularly in hard-to-understand areas
[x] I have made corresponding changes to non-Doxygen generated documentation
[x] I have ran Doxygen locally, and it builds the docs successfully
[x] My changes generate no errors on compile in Arduino IDE
[x] My changes generate no new warnings on compile in Arduino IDE
[x] Any dependent changes have been merged and published in downstream modules
[x] (For sketches only) This sketch complies with OH-INTERCONNECT v10
[ ] If this sketch requires additional libraries, I have added it as a sub-module per the Arduino Libraries section of the Software Manual.

[ ] I have tested the sketch in-circuit in DCS with DCS-BIOS and outputs (displays, LEDs, etc.) function as expected.
[ ] I have tested the sketch in-circuit in DCS with DCS-BIOS and HID inputs (switches, pots, etc.) function as expected, with switches moving the correct direction.
[x] I have tested the sketch in-circuit in DCS with DCS-BIOS and any logic in the sketch has been tested and functions as expected.
[ ] This code has not yet been tested in-circuit.
[ ] This code has not yet been tested in DCS-BIOS.

Installed sketch, without DCS running validated DCSBios messages for all switches.

With DCS running verified that the switches respond in the sim.