Solid Color Conductors
----------------------
* These blocks are only defined if mesecons and unifieddyes are loaded.

Provides 2 blocks that can be colored the same as Solid Color Block (with
the air brush) and is both a mesecons and digilines conductor.

The Solid Color Conductor block conducts in the 'default' directions and
the Solid Color Horizontal Conductor only conducts horizontally.
