Changes mine code, adds random mine spawners (#4817)

code/modules/mob/living/simple_animal/aliens/drone.dm

@@ -25,6 +25,7 @@
 	projectiletype = /obj/item/projectile/beam/drone
 	projectilesound = 'sound/weapons/laser3.ogg'
 	destroy_surroundings = 0
+	hovering = TRUE
 
 	//Drones aren't affected by atmos.
 	min_oxy = 0

code/modules/mob/living/simple_animal/animals/carp.dm

@@ -8,6 +8,7 @@
 
 	faction = "carp"
 	intelligence_level = SA_ANIMAL
+	hovering = TRUE
 	maxHealth = 25
 	health = 25
 	speed = 4

code/modules/mob/living/simple_animal/constructs/constructs.dm

@@ -8,6 +8,7 @@
 	response_disarm = "flailed at"
 	response_harm   = "punched"
 	intelligence_level = SA_HUMANOID // Player controlled.
+	hovering = TRUE
 	icon_dead = "shade_dead"
 	speed = -1
 	a_intent = I_HURT

code/modules/mob/living/simple_animal/humanoids/syndicate.dm

@@ -167,6 +167,7 @@
 	icon_state = "viscerator_attack"
 	icon_living = "viscerator_attack"
 	intelligence_level = SA_ROBOTIC
+	hovering = TRUE
 
 	faction = "syndicate"
 	maxHealth = 15