Water alpha fixes (#12877)

* Visor fix

* fix HUD stuff

* particles

code/game/atoms.dm

@@ -936,12 +936,12 @@ Proc for attack log creation, because really why not
 /atom/proc/specialclick(mob/living/carbon/user)
 	return
 
-
-//Consolidating HUD infrastructure
 /atom/proc/prepare_huds()
 	hud_list = new
 	for(var/hud in hud_possible) //Providing huds.
-		hud_list[hud] = image('icons/mob/hud.dmi', src, "")
+		var/image/new_hud = image('icons/mob/hud.dmi', src, "")
+		new_hud.appearance_flags = KEEP_APART
+		hud_list[hud] = new_hud
 
 /**
  * If this object has lights, turn it on/off.

code/game/objects/effects/particle_holder.dm

@@ -5,6 +5,7 @@
 	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
 	layer = ABOVE_ALL_MOB_LAYER
 	vis_flags = VIS_INHERIT_PLANE
+	appearance_flags = KEEP_APART|TILE_BOUND
 	///typepath of the last location we're in, if it's different when moved then we need to update vis contents
 	var/last_attached_location_type
 	///the main item we're attached to at the moment, particle holders hold particles for something

code/modules/clothing/modular_armor/attachments/visors.dm

@@ -12,6 +12,8 @@
 	greyscale_config = /datum/greyscale_config/visors
 	greyscale_colors = COLOR_VERY_LIGHT_GRAY
 	secondary_color = TRUE
+	appearance_flags = KEEP_APART|TILE_BOUND
+
 	///whether this helmet should be using its emissive overlay or not
 	var/visor_emissive_on = TRUE
 	///Whether or not the helmet is allowed to turn its emissive on or off.