- EditorActorLayer now tracks previews on map with a SpatiallyPartitioned instead of a Dictionary. This allows the copy-paste logic to call an efficient PreviewsInCellRegion method, instead of asking for previews cell-by-cell.
- EditorActorPreview subscribes to the CellEntryChanged methods on the map. Previously the preview was refreshed regardless of which cell changed. Now the preview only regenerates if the preview's footprint has been affected.
When dealing with isometric maps, the copy paste region needs to copy the CellCoords area covered by the CellRegion. This is equivalent to the selected rectangle on screen. Using the cell region itself invokes cell->map->cell conversion that doesn't roundtrip and thus some of the selected cells don't get copied.
Also when pasting terrain + actors, we need to fix the sequencing to clear actors on the current terrain, before adjusting the height and pasting in new actors. The current sequencing means we are clearing actors after having adjusted the terrain height, and affects the wrong area.
