Borer Tweaks and Changes (#8682)

Spawned borers now get added to the Ghostspawner menu, allowing players to inhabit them even if they didn't catch the original request.
    Borers have gained the ability to survey their host's health, allowing them to better choose when to administer certain chemicals.
    Borers now regenerate chemicals even if their host is unconscious.
    Awakening psionics now take 15 seconds instead of 10, and the host now gets a message about feeling something bad coming on, allowing them to make a dash to safety and or seclusion.
    Skrell returning from Srom no longer eject controlling borers to the lobby by replacing their ckey into the aether.
    Skrell no longer spontaneously die when entering Srom on a map that doesn't have a Srom location.

code/modules/shareddream/dream_entry.dm

@@ -8,7 +8,9 @@ var/list/dream_entries = list()
 	// If either changes, they should be nocked back to the real world.
 	if(can_commune() && stat == UNCONSCIOUS && sleeping > 1)
 		if(!istype(bg) && client) // Don't spawn a brainghost if we're not logged in.
-			bg = new(src) // Generate a new brainghost.
+			bg = new /mob/living/brain_ghost(src) // Generate a new brainghost.
+			if(isnull(bg)) // Prevents you from getting kicked if the brain ghost didn't spawn - geeves
+				return
 			bg.ckey = ckey
 			bg.client = client
 			ckey = "@[bg.ckey]"
@@ -27,8 +29,17 @@ var/list/dream_entries = list()
 			log_and_message_admins("has left the shared dream",bg)
 			var/mob/living/brain_ghost/old_bg = bg
 			bg = null
-			ckey = old_bg.ckey
+
+			var/return_text = "You are ripped from the Srom as your body awakens."
+			var/mob/return_mob = src
+
+			var/mob/living/simple_animal/borer/B = has_brain_worms()
+			if(B?.host_brain)
+				return_mob = B.host_brain
+				return_text = "You are ripped from the Srom as you return to the captivity of your own mind."
+
+			return_mob.ckey = old_bg.ckey
 			old_bg.show_message("<span class='notice'>[bg] fades as their connection is severed.</span>")
 			animate(old_bg, alpha=0, time = 200)
 			QDEL_IN(old_bg, 20)
-			to_chat(src, "<span class='warning'>You are ripped from the Srom as your body awakens.</span>")
+			to_chat(return_mob, SPAN_WARNING("[return_text]"))