Balloon Alerts for Gun Safety (#5152)

# About the pull request
When attempting to shoot a gun while safety is on (either the gun safety
itself or triggering help intent safety) you'll get a balloon alert
informing you.
help intent safety is on (will be in lowercase):

![image](https://github.com/cmss13-devs/cmss13/assets/54422837/1942e2ae-546b-4ab3-814f-2ef0e425544d)
gun safety toggled on:

![image](https://github.com/cmss13-devs/cmss13/assets/54422837/631db7b8-c266-42f5-a322-6d80882b86e1)

also decreases the size of the "Help intent safety is on! Switch to
another intent to fire your weapon." message to normal size.
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# Explain why it's good for the game

Reading chat when you're (presumably) in the middle of trying to shoot
at a xeno is quite hard, having it as a balloon alert allows you to
quickly realize what's happening.

# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog
:cl:
qol: Gun safety messages now use balloon alerts.
/:cl:

code/modules/projectiles/gun.dm

@@ -1538,6 +1538,7 @@ not all weapons use normal magazines etc. load_into_chamber() itself is designed
 
 		if(flags_gun_features & GUN_TRIGGER_SAFETY)
 			to_chat(user, SPAN_WARNING("The safety is on!"))
+			gun_user.balloon_alert(gun_user, "safety on")
 			return
 		if(active_attachable)
 			if(active_attachable.flags_attach_features & ATTACH_PROJECTILE)
@@ -1933,8 +1934,8 @@ not all weapons use normal magazines etc. load_into_chamber() itself is designed
 
 	if(gun_user.client?.prefs?.toggle_prefs & TOGGLE_HELP_INTENT_SAFETY && (gun_user.a_intent == INTENT_HELP))
 		if(world.time % 3) // Limits how often this message pops up, saw this somewhere else and thought it was clever
-			//Absolutely SCREAM this at people so they don't get killed by it
-			to_chat(gun_user, SPAN_HIGHDANGER("Help intent safety is on! Switch to another intent to fire your weapon."))
+			to_chat(gun_user, SPAN_DANGER("Help intent safety is on! Switch to another intent to fire your weapon."))
+			gun_user.balloon_alert(gun_user, "help intent safety")
 			click_empty(gun_user)
 		return FALSE