* [FancyZones] Remove obsolete code
The field `m_zoneSets` is unused, and may be removed.
* [FancyZones] Remove obsolete code
The field `m_windows` is unused, and may be removed.
* [FancyZones] Move adjustment of `RECT` to utils.cpp
By doing so, also fix a bug where a non-`WS_SIZEBOX` window (a window that should not be resized) was resized (and not properly resized) if it was zoned into more than one zone.
* [FancyZones] Complete rename `ZoneWindow` -> `WorkArea`
Fix leftovers from "[FancyZones] Rename ZoneWindow -> WorkArea (#12223)"
* [FancyZones] Refer to the move/size action as dragging
* [FancyZones] Rename `ActiveZoneSet` -> `ZoneSet`
There is only one zone set used by a work area.
* [FancyZones] Rename `zoneUuid` -> `layoutUuid`
The variable holds the UUID of the layout (not of a zone).
Co-authored-by: float4 <float4-unspecified-mail>
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