Medical HUD useability improvements (#413)

- bugfix: "Medical huds will now properly update as wounds heal
passively, or when bandaged"
- rscadd: "Added a new Medical HUD state between 70 and 100%, to better
recognise very small amounts of damage"
- rscadd: "Medical huds will no longer show the healthbar on crewmembers
who are at full health"
- rscadd: "Added a healthbar fadeout effect for when someone heals up to
100% while you're watching"
- tweak: "Medical huds now update more frequently"

code/modules/organs/organ_external.dm

@@ -559,7 +559,7 @@ Note that amputating the affected organ does in fact remove the infection from t
 
 	if((status & ORGAN_ROBOT) || (status & ORGAN_ADV_ROBOT)) //Robotic limbs don't heal or get worse.
 		return
-
+	var/updatehud
 	for(var/datum/wound/W in wounds)
 		// wounds can disappear after 10 minutes at the earliest
 		if(W.damage <= 0 && W.created + 10 * 10 * 60 <= world.time)
@@ -567,6 +567,9 @@ Note that amputating the affected organ does in fact remove the infection from t
 			continue
 			// let the GC handle the deletion of the wound
 
+		if (W.damage > 0)
+			updatehud = 1//If there are any wounds with damage to heal, then we'll update health huds
+
 		// Internal wounds get worse over time. Low temperatures (cryo) stop them.
 		if(W.internal && owner.bodytemperature >= 170)
 			var/bicardose = owner.reagents.get_reagent_amount("bicaridine")
@@ -604,6 +607,9 @@ Note that amputating the affected organ does in fact remove the infection from t
 
 	// sync the organ's damage with its wounds
 	src.update_damages()
+	if (updatehud)
+		owner.hud_updateflag = 1022
+
 	if (update_icon())
 		owner.UpdateDamageIcon(1)