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Hook up new output props allowDdcCi and detectedDdcCi

Jakob Petsovits requested to merge work/jpetso/ddc-ci-allowed into master

Companion MR for libraries/plasma-wayland-protocols!98 (merged) and related MRs linked from there.

Requires a new plasma-wayland-protocol revision with updates to output-device-v2, output-management-v2 and external-brightness-v1. This introduces the ddc_ci capability and a ddc_ci_allowed flag for outputs, as well as set_uses_ddc_ci for brightness devices.

KWin will store "allowDdcCi" and "detectedDdcCi" in its config.

If "detectedDdcCi" is set to true, based on the brightness device's usesDdcCi flag, then it will be remembered and exposed as ddc_ci capability. This in turn can be used by a settings UI to determine whether the "allowed" flag should be configurable.

If allowDdcCi is set to false, contradicting the default value, then a brightness device with usesDdcCi flag will not be assigned to an otherwise suitable output. KWin will use software brightness transformations instead.

Edited by Jakob Petsovits

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