[469b] UnrealEd silently changed (snapped to grid) pivot position on select Brush/Mover

[SeriousBuggie]

Reproduce:

1. Create any Brush/Mover.
2. Set Grid size to 1.
3. Move Brush/Mover to place where pivot will be not on grid 16.
4. Unselect Brush/Mover.
5. Set grid to 16.
6. Select Brush/Mover.

Expected result: Pivot position not changed.
Actual result: Pivot position snapped to grid with change it.

This typically break some pivot-related stuff:

1. Rotating Movers.
2. If you use really big grid, for small brushes pivot goes in unexpected positions and cause unexpected selection of brushes because selection of brush happen on select it pivot.
3. Sound produced by Movers appear on pivot position.
4. Light for movers calculated based on pivot position. If pivot outside map - mover will be black.
5. Possible something else.

[SeriousBuggie]

This totally awful. You try select rotating mover for set them dynamic lighted, but it move it away to snap grid.
And can be +/- if it be transactional. But no. You press ctrl+z and undo previous action, not this stupid mover movement.

[SeriousBuggie]

This happen basically everywhere for any mover.

Here another test case:
!. Set in UnrealEd grid size to 256.
2. Open mover_select_bug.zip
3. Select mover.
4. Start play map from editor.

Expected result: Cube rotate around one corner. You can see this, if set grid to 1, before open and select.

good.mp4

Actual result: cube rotate very different, because pivot moved away, after simple select mover:

bad.mp4