Revenant Tweaks (#11002)

Tau Ceti Basic speakers can now understand 80% of what revenants say.
    Revenants can now universally understand all languages.
    Revenants now spawn between 20 and 30 minutes into the round.
    Revenants now get a numerical identifier after their name that increments up from 1.

code/game/gamemodes/revenants/revenants.dm

@@ -4,6 +4,7 @@
 	required_players = 10
 	required_enemies = 0
 	round_autoantag = TRUE
+	var/first_spawn_delay = 20 MINUTES
 	min_autotraitor_delay = 3 MINUTES
 	max_autotraitor_delay = 6 MINUTES
 	antag_scaling_coeff = 4 // four people can handle one revenant pretty easily
@@ -11,7 +12,13 @@
 	extended_round_description = "This a wave defense gamemode. The crew all have to work together to repel an endless horde of bluespace horrors."
 	antag_tags = list(MODE_REVENANT)
 
+/datum/game_mode/revenants/New()
+	..()
+	first_spawn_delay = rand(20 MINUTES, 30 MINUTES)
+
 /datum/game_mode/revenants/process_autoantag()
+	if(world.time - round_start_time < first_spawn_delay)
+		return
 	var/datum/ghostspawner/revenant/R = SSghostroles.get_spawner(MODE_REVENANT)
 	var/datum/antagonist/A = all_antag_types[MODE_REVENANT]
 	A.update_current_antag_max()
@@ -20,4 +27,5 @@
 	if(R.max_count > previous_count)
 		say_dead_direct("A slot for a Revenant as opened up!<br>Spawn in as it by using the ghost spawner menu in the ghost tab, and try to be good!")
 	if(!R.enabled)
-		R.enable()
+		R.enable()
+	next_spawn = world.time + rand(min_autotraitor_delay, max_autotraitor_delay)