Port colord-kde to Qml & move it to plasma workspace

On Linux Application salon, I talked to Tyson Tan, he works on krita and Chinese translation. He also designed Konqi. One major problem he mentioned is the abandoned state of colord-kde. Color adjustment is crucial on high end displays. Because those high fidelity monitors have wider color range than normal monitors. And the intense color tends to hurt the eyes of user. While painting on those monitors, artists will unintentionally use dim color. And when the paintings are presenting on normal displays, it will be greylish as a result.

Colord is the application to config color management, and colord-kde is the config tools we have to config colord itself. However the current state of colord-kde is worrying. It's no longer maintained and by sheer luck it still functional, but maybe not for long. Also it's written in Qt Widget. I'd like to take the responsibility of maintaining it, and port the KCM to Qml. Since I've had some experience with the porting of Formats KCM.

On a broader perspective, it would also benifits Plasma Mobile. Since it's likely that a phone will have high end displays. And Android and iOS already have color adjustments settings. Even if Pine64 doesn't plan to rollout a phone with high fidelity display, this can help Plasma Mobile on PostmarketOS anyway.

The repo in question: https://invent.kde.org/graphics/colord-kde