IconGroup: Support floating scale factors #1628
Merged
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Needed to reduce the diff of #1570
The also adds the ability to cache close button pixbufs at multiple sizes, ready for a world where we potentially have multiple scaling factors in use at once.
Testing should involve anything with a close button (windows in Multitasking View, PiP windows, and the Icon Group containers at the bottom of the Multitasking view)