Adds more mixed gamemodes and make them votable (#2420)

-allow voting for most mixed gamemodes, with exception of bughunt and infection
-adds crossfire(merc and heister), also adds a raider frequency to don't mix them with mercs
-adds siege(rev and merc)
-adds visitors(ninja and wizard)

code/game/objects/items/devices/radio/encryptionkey.dm

@@ -21,6 +21,12 @@
 	origin_tech = list(TECH_ILLEGAL = 3)
 	syndie = 1//Signifies that it de-crypts Syndicate transmissions
 
+/obj/item/device/encryptionkey/raider
+	icon_state = "cypherkey"
+	channels = list("Raider" = 1)
+	origin_tech = list(TECH_ILLEGAL = 2)
+	syndie = 1
+
 /obj/item/device/encryptionkey/binary
 	icon_state = "cypherkey"
 	translate_binary = 1

code/game/objects/items/devices/radio/headset.dm

@@ -79,6 +79,11 @@
 	syndie = 1
 	ks1type = /obj/item/device/encryptionkey/syndicate
 
+/obj/item/device/radio/headset/raider
+	origin_tech = list(TECH_ILLEGAL = 2)
+	syndie = 1
+	ks1type = /obj/item/device/encryptionkey/raider
+
 /obj/item/device/radio/headset/binary
 	origin_tech = list(TECH_ILLEGAL = 3)
 	ks1type = /obj/item/device/encryptionkey/binary

code/game/objects/items/devices/radio/intercom.dm

@@ -77,6 +77,17 @@
 	. = ..()
 	internal_channels[num2text(SYND_FREQ)] = list(access_syndicate)
 
+/obj/item/device/radio/intercom/raider
+	name = "illicit intercom"
+	desc = "Pirate radio, but not in the usual sense of the word."
+	frequency = RAID_FREQ
+	subspace_transmission = 1
+	syndie = 1
+
+/obj/item/device/radio/intercom/syndicate/Initialize()
+	. = ..()
+	internal_channels[num2text(RAID_FREQ)] = list(access_syndicate)
+
 /obj/item/device/radio/intercom/Destroy()
 	QDEL_NULL(power_interface)
 	return ..()