Fixes some YAML linter errors.

The remaining errors are mostly the linter being overzealous.

Resources/Prototypes/Stacks/floor_tile_stacks.yml

@@ -1,55 +1,69 @@
 - type: stack
   id: FloorTileSteel
   name: steel tile
+  spawn: FloorTileItemSteel
 
 - type: stack
   id: FloorTileWood
   name: wood floor
+  spawn: FloorTileItemWood
 
 - type: stack
   id: FloorTileWhite
   name: white tile
+  spawn: FloorTileItemWhite
 
 - type: stack
   id: FloorTileDark
   name: dark tile
+  spawn: FloorTileItemDark
 
 - type: stack
   id: FloorTileTechmaint
   name: techmaint floor
+  spawn: FloorTileItemTechmaint
 
 - type: stack
   id: FloorTileFreezer
   name: freezer tile
+  spawn: FloorTileItemFreezer
 
 - type: stack
   id: FloorTileShowroom
   name: showroom tile
+  spawn: FloorTileItemShowroom
 
 - type: stack
   id: FloorTileGCircuit
   name: green-circuit floor
+  spawn: FloorTileItemGCircuit
 
 - type: stack
   id: FloorTileGold
   name: gold floor
+  spawn: FloorTileItemGold
 
 - type: stack
   id: FloorTileReinforced
   name: reinforced tile
+  spawn: FloorTileItemReinforced
 
 - type: stack
   id: FloorTileMono
   name: mono tile
+  spawn: FloorTileItemMono
 
 - type: stack
   id: FloorTileLino
   name: linoleum floor
+  spawn: FloorTileItemLino
 
 - type: stack
   id: FloorTileHydro
   name: hydro tile
+  spawn: FloorTileItemHydro
 
 - type: stack
   id: FloorTileDirty
   name: dirty tile
+  spawn: FloorTileItemDirty

Resources/Prototypes/Stacks/medical_stacks.yml

@@ -1,11 +1,17 @@
 - type: stack
   id: Ointment
   name: ointment
+  icon: "/Textures/Objects/Specific/Medical/medical.rsi/ointment.png"
+  spawn: Ointment
 
 - type: stack
   id: Gauze
   name: gauze
+  icon: "/Textures/Objects/Specific/Medical/medical.rsi/gauze.png"
+  spawn: Gauze
 
 - type: stack
   id: Brutepack
   name: brutepack
+  icon: "/Textures/Objects/Specific/Medical/medical.rsi/gauze.png"
+  spawn: Brutepack

Resources/Prototypes/Stacks/power_stacks.yml

@@ -7,8 +7,11 @@
 - type: stack
   id: CableMV
   name: mv cable
-  spawn: CableHVStack1
+  icon: "/Textures/Objects/Tools/cable-coils.rsi/coilmv-30.png"
+  spawn: CableMVStack1
 
 - type: stack
   id: CableHV
   name: hv cable
+  icon: "/Textures/Objects/Tools/cable-coils.rsi/coilhv-30.png"
+  spawn: CableHVStack1