Deprecation of DNA Modifier UI, AME, misc NanoUI templates, and _old spritefiles. (#22320)

Lead-up to final push on NanoUI conversion; AME was removed (w approval
from Matt), DNA modifier will not be converted to Nano at this time, a
heap of templates and associated unused sprite files also removed.

code/modules/cargo/items/engineering.dm

@@ -586,20 +586,6 @@
 	groupable = TRUE
 	spawn_amount = 1
 
-/singleton/cargo_item/packagedantimatterreactorsection
-	category = "engineering"
-	name = "packaged antimatter reactor section"
-	supplier = "eckharts"
-	description = "A section of antimatter reactor shielding. Do not eat."
-	price = 220
-	items = list(
-		/obj/item/am_shielding_container
-	)
-	access = ACCESS_CE
-	container_type = "crate"
-	groupable = TRUE
-	spawn_amount = 1
-
 /singleton/cargo_item/debugger
 	category = "engineering"
 	name = "debugger"
@@ -840,34 +826,6 @@
 	groupable = TRUE
 	spawn_amount = 1
 
-/singleton/cargo_item/antimattercontainmentjar
-	category = "engineering"
-	name = "antimatter containment jar"
-	supplier = "eckharts"
-	description = "Holds antimatter. Warranty void if exposed to matter."
-	price = 280
-	items = list(
-		/obj/item/am_containment
-	)
-	access = ACCESS_CE
-	container_type = "crate"
-	groupable = TRUE
-	spawn_amount = 1
-
-/singleton/cargo_item/antimattercontrolunit
-	category = "engineering"
-	name = "antimatter control unit"
-	supplier = "eckharts"
-	description = "The control unit for an antimatter reactor. Probably safe."
-	price = 1950
-	items = list(
-		/obj/machinery/power/am_control_unit
-	)
-	access = ACCESS_CE
-	container_type = "crate"
-	groupable = TRUE
-	spawn_amount = 1
-
 /singleton/cargo_item/alphaparticlegenerationarray
 	category = "engineering"
 	name = "Alpha Particle Generation Array"