This commit changes the action drawer colorsets to be contextually correct. The panel background would use the window background colors (instead of the view ones), and quicksettings delegates would use colors from the Button color set (rather than the view).
This also changes the background scrim to always be dark even in light mode. I think this is important to do because we have two views (notifications, and quick settings), which currently don't have much in the way of colours to distinguish the two.
This commit also makes some changes to the notifications widget in order for its card foreground to be the standard theme colors.
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We so far have been recreating the background elements for all the item throughout the shell. This merge request simplifies this by unifying these elements into a single component, making is easier to keep things at a consistent design while also being able to adjust things when needed in the future.
Per request, I tried to keep thing looking mostly the same as before.
The first picture is what the action drawer looks like now, the one after is with these changes.
Adjusted the colors of the notifications and media controls to help them fit in better together.
Move from a C++ library + QML plugin to a QML plugin only for simplicity, since the homescreen switching architecture will be done from Plasma, and so use of the shell library only needs to be from QML.
