Fixes some RPD bugs

Fixes pipe painting not working.
Fixes 4-way manifolds and disposals chutes displaying broken icons.
Fixes the lack of Sort Junctions from the RPD.
Fixes drones being unable to use the RPD.
Fixes #6627 
Fixes #6637
Could you add : ```P.stored.color = paint_colors[paint_color]``` ?
That would allows to keep color on wrenching/unwrenching.