VOXEDIT: Allow to move groups in edit mode

[DryByte]

1. You can't move groups, when trying to move a group voxedit not allows you to do so, it moves 1 block and resets it with the following message: Could not execute the desired action on any visible node

2. You can't undo moves in editmode.

3. The axis for moving is located in 0,0,0 and not wheres the group position is at.

Screenshot for context:

On there i tried to move the tree_zone group and got the message, all nodes are active.