Selection modes
I introduced new modes for the selection. There’s now Set, Add and Remove.
This way it’s pretty easy to select any number of Structures.
I also improved the selection behavior in general. Anything that’s touched by the selection rectangle is now correctly considered as ‘hit’.
Rotation rework
I applied several changes to rotations in general. Structures don’t hold their own rotation value anymore and instead they are now tracked by more general containers.
In the process I also fixed bugs regarding the rotation and introduced new ones that I then fixed as well :D
Now it’s looking all good, tho.