Regal Rat - Maint Creatures DLC Update (#71343)

## About The Pull Request
The regal rat can now convert frogs and cockroaches to their army. They
also will not attack each other with the new maintenance creature
faction. BirdBoat has also been added to this faction since he also
naturally appears in the maintenance.
## Why It's Good For The Game
Make sure to avoid stepping on the cockroaches. They do have one extra
health though.

![promo](https://user-images.githubusercontent.com/25363960/202822758-f611f861-596a-4850-8279-af0bac9e3d0f.PNG)
## Changelog
🆑
add: Frogs and cockroaches can now be converted to the regal rats army.
fix: Converted rat do not attack mouses anymore.
imageadd: New sewer cockroach and trash frog sprites
/🆑

code/modules/mob/living/basic/vermin/mouse.dm

@@ -16,7 +16,7 @@
 	held_w_class = WEIGHT_CLASS_TINY
 	mob_biotypes = MOB_ORGANIC|MOB_BEAST
 	gold_core_spawnable = FRIENDLY_SPAWN
-	faction = list(FACTION_RAT)
+	faction = list(FACTION_RAT, FACTION_MAINT_CREATURES)
 	butcher_results = list(/obj/item/food/meat/slab/mouse = 1)
 
 	speak_emote = list("squeaks")
@@ -345,7 +345,7 @@
 /// AI controller for rats, slightly more complex than mice becuase they attack people
 /datum/ai_controller/basic_controller/mouse/rat
 	blackboard = list(
-		BB_TARGETTING_DATUM = new /datum/targetting_datum/basic/rat(),
+		BB_TARGETTING_DATUM = new /datum/targetting_datum/basic(),
 		BB_BASIC_MOB_CURRENT_TARGET = null, // heathen
 		BB_CURRENT_HUNTING_TARGET = null, // cheese
 		BB_LOW_PRIORITY_HUNTING_TARGET = null, // cable
@@ -367,6 +367,3 @@
 
 /datum/ai_behavior/basic_melee_attack/rat
 	action_cooldown = 2 SECONDS
-
-/datum/targetting_datum/basic/rat
-	check_factions_exactly = TRUE