[Feature Request] Make groups stick to the grid... and allow locking groups too

Per title. It would be great if node groups would also snap to grid when moving or resizing, just like nodes do now, that way we don't move every node out of the grid if we move the group anywhere.

While we're at it, please add a feature to lock groups in place so that they (or their child nodes) can't be moved unless explicitly unlocked back. I have wasted way too much time fixing an entire workflow because I accidentally moved a whole group while trying to pan the view, making it land over other nodes which now get moved as well if I try to move that group back to its place.