Support reduced motion - #2918
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Reduced motion will be needed across the whole code base rather often. Going through the style manager is a long line of code so add a simple getter.
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Closes #2917
Not sure whether we should replace disabling animations or just use reduce motion additionally. I went with the second because completely disabling animations is still useful as a performance option.
This PR now doesn't animate when reduced motion is on. However in addition I added reduce motion handling to the transition builder to allow to have pure opacity transitions still running.
This means that now window open/delete/minimize etc. only do the opacity transition and not the scale.
As for the rest there are a few places where we already use opacity but don't use transition builder. I think we should port those to transition builder and then support reduce motion properly (in a follow up).
However I think for other places that don't already do opacity, like switching workspaces or opening the multitasking view it doesn't make a lot of sense to add an extra crossfade transition for now. This would probably need a lot of refactoring and doesn't bring the advantage that the normal animation brings (i.e. conveying information about switching left, right, etc.)