Adds verb to change eye color at will (if mechanical)

Adds a verb used by humanoid mobs that have mechanical eyes, which allows them to pick a new color, and have it applied instantly.
Adds some helper functions, specifically hex2rgb(), to convert hexadecimal colors to a list of numbers for r, g, and b.

code/_helpers/type2type.dm

@@ -149,6 +149,26 @@
 	if (rights & R_MENTOR)      . += "[seperator]+MENTOR"
 	return .
 
+// Converts a hexadecimal color (e.g. #FF0050) to a list of numbers for red, green, and blue (e.g. list(255,0,80) ).
+/proc/hex2rgb(hex)
+	// Strips the starting #, in case this is ever supplied without one, so everything doesn't break.
+	if(findtext(hex,"#",1,2))
+		hex = copytext(hex, 2)
+	return list(hex2rgb_r(hex), hex2rgb_g(hex), hex2rgb_b(hex))
+
+// The three procs below require that the '#' part of the hex be stripped, which hex2rgb() does automatically.
+/proc/hex2rgb_r(hex)
+	var/hex_to_work_on = copytext(hex,1,3)
+	return hex2num(hex_to_work_on)
+
+/proc/hex2rgb_g(hex)
+	var/hex_to_work_on = copytext(hex,3,5)
+	return hex2num(hex_to_work_on)
+
+/proc/hex2rgb_b(hex)
+	var/hex_to_work_on = copytext(hex,5,7)
+	return hex2num(hex_to_work_on)
+
 // heat2color functions. Adapted from: http://www.tannerhelland.com/4435/convert-temperature-rgb-algorithm-code/
 /proc/heat2color(temp)
 	return rgb(heat2color_r(temp), heat2color_g(temp), heat2color_b(temp))

code/modules/organs/organ_internal.dm

@@ -104,6 +104,7 @@
 	icon = 'icons/obj/robot_component.dmi'
 	icon_state = "camera"
 	dead_icon = "camera_broken"
+	verbs |= /obj/item/organ/internal/eyes/proc/change_eye_color
 
 /obj/item/organ/internal/eyes/robot
 	name = "optical sensor"
@@ -112,6 +113,26 @@
 	..()
 	robotize()
 
+/obj/item/organ/internal/eyes/proc/change_eye_color()
+	set name = "Change Eye Color"
+	set desc = "Changes your robotic eye color instantly."
+	set category = "IC"
+	set src in usr
+
+	var/current_color = rgb(eye_colour[1],eye_colour[2],eye_colour[3])
+	var/new_color = input("Pick a new color for your eyes.","Eye Color", current_color) as null|color
+	if(new_color && owner)
+		// input() supplies us with a hex color, which we can't use, so we convert it to rbg values.
+		var/list/new_color_rgb_list = hex2rgb(new_color)
+		// First, update mob vars.
+		owner.r_eyes = new_color_rgb_list[1]
+		owner.g_eyes = new_color_rgb_list[2]
+		owner.b_eyes = new_color_rgb_list[3]
+		// Now sync the organ's eye_colour list.
+		update_colour()
+		// Finally, update the eye icon on the mob.
+		owner.update_eyes()
+
 /obj/item/organ/internal/eyes/replaced(var/mob/living/carbon/human/target)
 
 	// Apply our eye colour to the target.