Abling Disability (#4485)

This PR implements a system for manipulating a client's color safely and also ports a prioritization system for sorting client color from /tg/. Currently this PR also implements client coloration in the form of color blindness, namely:
Monochromacy
Deuteranopia
Tritanopia
Protanopia

DTP are mild brain traumas, whereas monocrhomacy is a severe brain trauma.
Furthermore, this PR removes the Needs Glasses prompt in character creation, and replaces it with a disability selector, allowing people to more closely refine their special little snowflakes.
Current disabilities available:
Nervousness
Nearsightedness
Deuteranopia
Tritanopia
Protanopia
Deafness
Muteness

code/modules/power/singularity/singularity.dm

@@ -10,6 +10,7 @@
 	layer = 6
 	light_power = -100 //eats all light
 	unacidable = 1 //Don't comment this out.
+	appearance_flags = NO_CLIENT_COLOR
 
 	var/current_size = 1
 	var/allowed_size = 1