Small fixes and a new atom flag.

* Fixes the ( shaped cyan wire appearing purple.
* Fixes a luminosity bug with glowshrooms.
* Changes a ridiculous internal loop in intercoms to use the MC.
* Makes intercoms not be bloodied by bloody hands.
* Adds a "NOBLOODY" flag for atoms that don't want to be bloodied.

Consolidation of #1517 and #1518