Add Gravity Generator, place on tether, update events

code/modules/gamemaster/event2/events/everyone/gravity_vr.dm

@@ -0,0 +1,45 @@
+/datum/event2/meta/gravity
+	name = "gravity failure"
+	departments = list(DEPARTMENT_EVERYONE)
+	chaos = 20
+	chaotic_threshold = EVENT_CHAOS_THRESHOLD_LOW_IMPACT
+	reusable = TRUE
+	event_type = /datum/event2/event/gravity
+
+/datum/event2/meta/gravity/get_weight()
+	return (20 + (metric.count_people_in_department(DEPARTMENT_EVERYONE) * 20)) / (times_ran + 1)
+
+
+
+
+/datum/event2/event/gravity
+	length_lower_bound = 5 MINUTES
+	length_upper_bound = 20 MINUTES
+	var/list/generators = list()
+
+/datum/event2/event/gravity/announce()
+	command_announcement.Announce("Feedback surge detected in mass-distributions systems. Artificial gravity has been disabled. Please wait for the system to reinitialize, or contact your engineering department.", "Gravity Failure")
+
+/datum/event2/event/gravity/start()
+	gravity_is_on = 0
+
+	for(var/obj/machinery/gravity_generator/main/GG in machines)
+		if((GG.z in get_location_z_levels()) && GG.on)
+			generators += GG
+			GG.breaker = FALSE
+			GG.set_power()
+			GG.charge_count = 10
+
+/datum/event2/event/gravity/end()
+	gravity_is_on = 1
+	
+	var/did_anything = FALSE
+	for(var/obj/machinery/gravity_generator/main/GG in generators)
+		if(!GG.on)
+			GG.breaker = TRUE
+			GG.set_power()
+			GG.charge_count = 90
+			did_anything = TRUE
+
+	if(did_anything)
+		command_announcement.Announce("Gravity generators are again functioning within normal parameters. Sorry for any inconvenience.", "Gravity Restored")