feat: Added new floor sprites

data/json/external_tileset/External_Tileset_DP_terrain_normal.json

@@ -160,7 +160,19 @@
           { "id": "t_door_makeshift_c", "fg": 152 },
           { "id": "t_door_makeshift_o", "fg": 153, "bg": 95 },
           { "id": "t_door_metal_locked", "fg": 154 },
-          { "id": "t_door_metal_locked_o", "fg": 155, "bg": 127 }
+          { "id": "t_door_metal_locked_o", "fg": 155, "bg": 127 },
+          {
+            "id": "t_concrete",
+            "fg": [
+              { "weight": 90, "sprite": 157 },
+              { "weight": 90, "sprite": 158 },
+              { "weight": 90, "sprite": 159 },
+              { "weight": 90, "sprite": 160 }
+            ],
+            "bg": 156
+          },
+          { "id": "t_floor_waxed", "fg": 161 },
+          { "id": "t_floor_waxed_y", "fg": 162 }
         ],
         "sprite_width": 32,
         "sprite_height": 32

doc/src/content/docs/en/mod/json/reference/graphics/external_tileset.md

@@ -106,14 +106,15 @@ Ultica are planned for the future.
 - Animated portal sprites.
 - Sprites for bone cuirass and greaves. Reimplementation of previously-obsoleted bone armor specific
   to BN.
-- New sprites for generated sidewalks. Specific to BN.
-- Updated sprites for brick walls.
-- Updated/New sprites for most doors.
 
 ### External_Tileset_DP_terrain_normal.png
 
 - Rice paddies. Terrain specific to BN.
 - Niter beds. Terrain specific to BN.
+- New sprites for generated sidewalks. Specific to BN.
+- Updated sprites for brick walls.
+- Updated/New sprites for most doors.
+- New floor sprites for linoleum, concrete and waxed floors.
 
 ### External_Tileset_DP_Tall.png