Build mode improvements: mirror voxels and elements, copy/paste more voxels, & maintain voxelmancy
Add a mirror mode that let's you place voxels mirrored to each other.
Set copt paste to allow far more voxels to be copied at once.
Set copy/paste to maintain voxelmancy shapes instead of changing vertex priority on paste and ruining the shape.
Allow elements to be mirrored.
Add a means of including elements in mirroring and copy/pasting.