wall now uses terrain tileset

Former-commit-id: 13b5389d905c1c302ec4e7991fbfdd06ed333814
Former-commit-id: 1416055d9aa0755147c461512f9b638e25df908e

src/net/torvald/terrarum/gameactors/FixtureBase.kt

@@ -12,23 +12,18 @@ open class FixtureBase : ActorWithBody() {
      * 2: Platform; can be stood on, press DOWN to go down. Also allows other blocks can be places on top of it (e.g. torch)
      * 3: Wall_left; blocks rightward movement
      * 4: Wall_right: blocks leftward movement
+     * 5: Same as 2 but player CANNOT go down
      * For example, flag of 4 is good for tables; player can stand on, which means
      * downward movement is blocked within the fixtures' AABB.
      */
     var collisionFlag: Int = 0
 
-    /**
-     * Normally if player is standing on the fixtures (with flag 2 -- COLLISION_PLATFORM),
-     * pressing DOWN wiil allow player to get down.
-     * Setting this flag TRUE will block such movement (player cannot get down)
-     */
-    var cannotPassThru = false
-
     companion object {
         val COLLISION_OPEN = 0
         val COLLISION_BLOCKED = 1
         val COLLISION_PLATFORM = 2
         val COLLISION_WALL_LEFT = 3
         val COLLISION_WALL_RIGHT = 4
+        val COLLISION_PLATFORM_NOGODOWN = 5
     }
 }