Differentiate between LED-Device Enable/Disable and Switch On/Off

[Lord-Grey]

Summary

Differentiate between LED-Device Enable/Disable and Switch On/Off allows to
switch off LED-Devices output when there is no signal e.g. given no source is available any longer.
In case input is available again, LED-Devices are switched on.
In both cases, the LED-Device shows enabled allowing to differentiate from error state or a suspend/resume scenario.

Currently, switch on/off is implemented, if no source is available (addressing #828).

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Other, please describe:

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Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing setups:

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's body (e.g. Fixes: #xxx[,#xxx], where "xxx" is the issue number)

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature
• Related documents have been updated (docs/docs/en)

• Related tests have been updated

PLEASE DON'T FORGET TO ADD YOUR CHANGES TO CHANGELOG.MD

• Yes, CHANGELOG.md is also updated

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Other information:

Fixes: #828

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[gogui63]

Any news when that will be merged into master?

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[Paulchen-Panther]

@Lord-Grey Is the PR done so far?

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Yes, Let us merge the PR now.

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