Multiple turrets on one voxel

This would be incredibly useful for ships such as the cruiser and any other vessel with more than one turret. One of the turrets can optionally be mounted on the other to form a cupola, this means that it position is dependent on the parent turrets position, perfect for tanks.

I've also thought of a naming convention where x represents the voxel name. xtur.vxl is still viable as a single turret. If the user wishes to have more than one they could use xtura.vxl , b, c, d etc. And for cupolas, you could specify the turret you wish to add one too and then just add cup like xturcup.vxl.