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/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.