i think it works

MAJOR antag backend update
- you cannot bruteforce the pen anymore
- uplink now uses bitflag to lock purchases
- poplock is handled entirely by the buyable uplink items
- tgui antag intro (for selected ones)

code/modules/uplink/uplink_items/uplink_explosives.dm

@@ -15,7 +15,7 @@
 	item = /obj/item/grenade/chem_grenade/bioterrorfoam
 	cost = 5
 	surplus = 35
-	include_modes = list(/datum/game_mode/nuclear, /datum/game_mode/nuclear/clown_ops)
+	purchasable_from = UPLINK_NUKE_OPS | UPLINK_CLOWN_OPS
 
 /datum/uplink_item/explosives/bombanana
 	name = "Bombanana"
@@ -24,7 +24,7 @@
 	item = /obj/item/reagent_containers/food/snacks/grown/banana/bombanana
 	cost = 4 //it is a bit cheaper than a minibomb because you have to take off your helmet to eat it, which is how you arm it
 	surplus = 0
-	include_modes = list(/datum/game_mode/nuclear/clown_ops)
+	purchasable_from = UPLINK_CLOWN_OPS
 
 /datum/uplink_item/explosives/buzzkill
 	name = "Buzzkill Grenade Box"
@@ -33,7 +33,7 @@
 	item = /obj/item/storage/box/syndie_kit/bee_grenades
 	cost = 15
 	surplus = 35
-	include_modes = list(/datum/game_mode/nuclear, /datum/game_mode/nuclear/clown_ops)
+	purchasable_from = UPLINK_NUKE_OPS | UPLINK_CLOWN_OPS
 
 /datum/uplink_item/explosives/c4
 	name = "Composition C-4"
@@ -58,7 +58,6 @@
 	item = /obj/item/storage/backpack/duffelbag/syndie/x4
 	cost = 4 //
 	cant_discount = TRUE
-	exclude_modes = list(/datum/game_mode/traitor/internal_affairs)
 
 /datum/uplink_item/explosives/clown_bomb_clownops
 	name = "Clown Bomb"
@@ -70,7 +69,7 @@
 	item = /obj/item/sbeacondrop/clownbomb
 	cost = 15
 	surplus = 0
-	include_modes = list(/datum/game_mode/nuclear/clown_ops)
+	purchasable_from = UPLINK_CLOWN_OPS
 
 /datum/uplink_item/explosives/detomatix
 	name = "Detomatix PDA Cartridge"
@@ -97,14 +96,14 @@
 	item = /obj/item/storage/box/syndie_kit/tuberculosisgrenade
 	cost = 8
 	surplus = 35
-	include_modes = list(/datum/game_mode/nuclear, /datum/game_mode/nuclear/clown_ops)
+	purchasable_from = UPLINK_NUKE_OPS | UPLINK_CLOWN_OPS
 	restricted = TRUE
 
 /datum/uplink_item/explosives/grenadier
 	name = "Grenadier's belt"
 	desc = "A belt containing 26 lethally dangerous and destructive grenades. Comes with an extra multitool and screwdriver."
 	item = /obj/item/storage/belt/grenade/full
-	include_modes = list(/datum/game_mode/nuclear)
+	purchasable_from = UPLINK_NUKE_OPS
 	cost = 22
 	surplus = 0
 
@@ -125,7 +124,6 @@
 			be defused, and some crew may attempt to do so."
 	item = /obj/item/sbeacondrop/bomb
 	cost = 11
-	exclude_modes = list(/datum/game_mode/traitor/internal_affairs)
 
 /datum/uplink_item/explosives/syndicate_detonator
 	name = "Syndicate Detonator"
@@ -135,7 +133,7 @@
 			the blast radius before using the detonator."
 	item = /obj/item/syndicatedetonator
 	cost = 3
-	include_modes = list(/datum/game_mode/nuclear, /datum/game_mode/nuclear/clown_ops)
+	purchasable_from = UPLINK_NUKE_OPS | UPLINK_CLOWN_OPS
 
 /datum/uplink_item/explosives/syndicate_minibomb
 	name = "Syndicate Minibomb"
@@ -143,7 +141,7 @@
 			in addition to dealing high amounts of damage to nearby personnel."
 	item = /obj/item/grenade/syndieminibomb
 	cost = 6
-	exclude_modes = list(/datum/game_mode/nuclear/clown_ops, /datum/game_mode/traitor/internal_affairs)
+	purchasable_from = ~UPLINK_CLOWN_OPS
 
 /datum/uplink_item/explosives/tearstache
 	name = "Teachstache Grenade"
@@ -152,7 +150,7 @@
 	item = /obj/item/grenade/chem_grenade/teargas/moustache
 	cost = 3
 	surplus = 0
-	include_modes = list(/datum/game_mode/nuclear/clown_ops)
+	purchasable_from = UPLINK_CLOWN_OPS
 
 /datum/uplink_item/explosives/viscerators
 	name = "Viscerator Delivery Grenade"
@@ -161,4 +159,4 @@
 	item = /obj/item/grenade/spawnergrenade/manhacks
 	cost = 5
 	surplus = 35
-	include_modes = list(/datum/game_mode/nuclear, /datum/game_mode/nuclear/clown_ops)
+	purchasable_from = UPLINK_NUKE_OPS | UPLINK_CLOWN_OPS