Add color setting for NPC magic casting (enemies, automatons)

Add color setting for NPC magic casting (enemies, automatons). 
New setting is available in colors.xml file:
		< mobspellcol >0< /mobspellcol >
This will change color of spells casted by NPCs (primarily any mob, but also player's automaton).
To set the color of player casted magic, use currently present setting:
		< spellcol >0< /spellcol >