[MIRROR] remove /effect/ from non-effect paths

[SierraHelper]

Оригинальный PR: Baystation12#34221

also flattens /datum/effect/system and /datum/effect/effect/system into /datum/effect

nufc, but lorge

[SuhEugene]

• /obj/item/stack/package_wrap/twenty_five -> /obj/item/stack/package_wrap/cargo_wrap
• /obj/item/wrapping_paper -> /obj/item/stack/package_wrap/gift_wrap
• /obj/effect/overmap -> /obj/overmap
• /obj/effect/landmark -> /obj/landmark
• /obj/effect/shuttle_landmark -> /obj/shuttle_landmark
• /obj/effect/submap_landmark -> /obj/submap_landmark
• /obj/effect/decal -> /obj/decal
• /obj/effect/wallframe_spawn -> /obj/wallframe_spawn
• /obj/effect/overlay -> /obj/overlay
  я вам по носу дам если увижу на маппинге эти чёрные квадраты с эксодуса
• /obj/effect/gibspawner -> /obj/gibspawner
• /obj/effect/floor_decal -> /obj/floor_decal
• /obj/effect/catwalk_plated -> /obj/catwalk_plated
• /obj/effect/paint_stripe -> /obj/paint_stripe
• /obj/effect/paint -> /obj/paint
• /obj/effect/fluid_mapped -> /obj/fluid_mapped
• /obj/effect/engine_setup -> /obj/engine_setup
• /obj/effect/spider -> /obj/spider
• /obj/effect/step_trigger -> /obj/step_trigger
• /obj/effect/forcefield -> /obj/forcefield