Schematic Populator

[nvx]

Implement a selectable populator that can load schematics into the generated cleanroom chunks, either one off or repeating in one or more of the 3 axis's centred on a definable point.

With the correct schematic, this will provide the same functionality as requested in https://github.com/nvx/CleanroomGenerator/pull/1 but in a generic manner.

[hwei]

This is a much better feature. :)