Lemurian Sea (#22686)

changes:
  - refactor: "Refactors Gravity Generator UI from HTML to TGUI."
- rscadd: "Adds sector-based modifier var 'overmap_hazards_multiplier'
for generating total overmap hazard count."
  - soundadd: "Adds new Lemurian Sea 'welcome' announcements."
- rscadd: "Added Lemurian Sea gravitic anomalies as overmap hazards and
random events."
  - rscadd: "Adds ADPI/The Voices."
- rscadd: "Adds ADPI Panel for modmins to send ADPI messages to a single
character or all characters from their respective pools, or custom
messages."
- balance: "Vaurca Hivenet communication, the Hivenet Manifest, and
Hivenet Echoes are now disabled while the ship is in Lemurian Sea
sectors."

code/modules/admin/topic.dm

@@ -939,6 +939,9 @@
 		if(!(GLOB.all_languages[LANGUAGE_VAURCA] in H.languages))
 			to_chat(usr, "The person you are trying to contact is incapable of recieving Hivenet transmissions.")
 			return
+		if(is_lemurian_sea_sector())
+			to_chat(usr, "The Lemurian Sea prevents Hivenet transmissions.")
+			return
 		var/input = sanitize(input(src.owner, "Please enter a message to reply to [key_name(H)] via the Hivenet.", "Outgoing transmission from the Hive...", ""))
 		if(!input)	return
 		to_chat(src.owner, "You sent [input] to [H] via a secure Hivenet channel.")