Add fixture `stairville/retro-flat-par-18x10-rgbwa-uv`

[FloEdelmann]

• Add fixture stairville/retro-flat-par-18x10-rgbwa-uv

Thank you clemzouzou69!

[github-actions[bot]]

Export files validity

(Output of test script tests/github/exports-valid.js.)

Test the exported files of selected fixtures against the plugins' export tests. You can run a plugin's export tests by executing: $ node cli/run-export-test.js -p <plugin name> <fixtures>

✔️ stairville / retro-flat-par-18x10-rgbwa-uv: d-light / attributes-correctness

• ✔️ stairville/retro-flat-par-18x10-rgbwa-uv-8.xml

✔️ stairville / retro-flat-par-18x10-rgbwa-uv: dmxcontrol3 / channel-numbers

• ✔️ stairville-retro-flat-par-18x10-rgbwa-uv-8.xml

✔️ stairville / retro-flat-par-18x10-rgbwa-uv: dragonframe / json-schema-conformity

• ✔️ stairville/retro-flat-par-18x10-rgbwa-uv.json
• ✔️ manufacturers.json

✔️ stairville / retro-flat-par-18x10-rgbwa-uv: millumin / json-schema-conformity

• ✔️ stairville/retro-flat-par-18x10-rgbwa-uv.json

✔️ stairville / retro-flat-par-18x10-rgbwa-uv: qlcplus_4.12.2 / fixture-tool-validation

• ✔️ fixtures/Stairville-Retro-Flat-Par-18x10-RGBWA-UV.qxf

✔️ stairville / retro-flat-par-18x10-rgbwa-uv: qlcplus_4.12.2 / xsd-schema-conformity

• ✔️ fixtures/Stairville-Retro-Flat-Par-18x10-RGBWA-UV.qxf

[kengruven]

Same fixture as #2496, and neither one is obviously better/complete. Both are 8-ch only, and also need 6/10-ch modes, but are a great start.