Add Chauvet DJ SlimPAR 64

[aarongeiser]

New fixture: Chauvet DJ SlimPAR 64

Source: SlimPAR 64 User Manual Rev. 5

Modes included

• 3-channel (RGB)
• 7-channel (RGB + Color Macros + Speed/Strobe + Mode + Dimmer)

Known limitations / help wanted

• Channel 5 (Speed / Strobe) is dual-purpose depending on Channel 6's value.
  It acts as a strobe channel when Ch6 is in RGB mode (0–31) or Sound mode (224–255),
  and as an effect speed channel when Ch6 is in any effect mode (32–223).
  Flagged with helpWanted — a switching channel approach may model this more accurately.

🤖 Generated with Claude Code

[luc122c]

• Channel 5 (Speed / Strobe) is dual-purpose depending on Channel 6's value.
  It acts as a strobe channel when Ch6 is in RGB mode (0–31) or Sound mode (224–255),
  and as an effect speed channel when Ch6 is in any effect mode (32–223).
  Flagged with helpWanted — a switching channel approach may model this more accurately.

Yes, it should be a switching channel. The documentation for this is here: https://github.com/OpenLightingProject/open-fixture-library/blob/master/docs/fixture-format.md#switching-channels and an example can be found here: https://github.com/OpenLightingProject/open-fixture-library/blob/master/fixtures/futurelight/pro-slim-par-7-hcl.json#L252

[FloEdelmann]

@aarongeiser something is off with your local development setup: This PR also contains the fixture from #5575, and #5613 also contains this PR and #5575. It would be best to have all fixtures in separate commits, or only group similar fixtures in one PR (e.g. the RGB variant and the RGBA variant in one PR). Thus, I'll close this PR in favor of #5613 and remove the unrelated fixture from there.