Always set defaultValue when it makes sense

Edit by @Fxedel:

• Make defaultValue required in the fixture editor, but add a checkbox "This channel has no meaningful default value" -> it can't be forgotten to enter a default value
  • Maybe wait until help bubbles (#432) have been implemented before?
• Add defaultValues in all existing fixtures to channels where they are missing
• As soon as these points have been finished: Export NULL in D::Light plugin if default value is not present

See discussion below.

Hi guys :)
it's not an issue, but more a request...

some availableChannels (like FX in MacAura) have a defaultValue parameter.

I don't know how other software does, but in D::Light this could be treated as HOME parameter.

DL can handle specific values like 0,HALF,FULL,NULL and all the range between 0-255

HOME parameter is useful in a personality to 'reset' the device and setting the shutter to open, and the Pan/Tilt to HALF is something I've found useful.
NULL is for functions that won't be touched by the HOME call

best regards,
nicolas

Start by locating the fixture editor, the existing fixture definitions, and the D::Light plugin mentioned in the issue. Review how availableChannels and defaultValue are represented, then use the checklist as the completion criteria: enforce or explicitly exempt defaults, add missing values, and export NULL where appropriate.