Introducing /autoprogram

[Magic :^)]

My conversion program is pretty close to perfect now, I'm just dawdling about adding more non-essential features on a whim.

I wanna get some good documentation done with examples of autoprog templates and output but....

I have no idea where to find a decent explanation of how to use the autoprog format xD
I've pieced together the general syntax from the source code and that one youtube video, but I'd like some clarification on:
- how blocks are placed relative to your position
- how blocks are rotated relative to your position (and the limitations if any)
- how to define custom blocks and metadata for said blocks

also, there is no operator in the source code to do x -= 1
that's kinda important?