Physics stuff Float -> Double

Former-commit-id: 54ccee75769691aa6aaa2416767bd15270f63347
Former-commit-id: 61e892434f48adf11e3ca49b60928a930fd5cde9

src/net/torvald/terrarum/gameitem/InventoryItem.kt

@@ -17,12 +17,12 @@ interface InventoryItem {
     /**
      * Weight of the item, Float
      */
-    var mass: Float
+    var mass: Double
 
     /**
      * Scale of the item. Real mass: mass * (scale^3)
      */
-    var scale: Float
+    var scale: Double
 
     /**
      * Effects applied while in pocket

src/net/torvald/terrarum/gameitem/TileAsItem.kt

@@ -9,12 +9,12 @@ import org.newdawn.slick.GameContainer
 class TileAsItem(tileNum: Int) : InventoryItem {
 
     override var itemID: Int = 0
-    override var mass: Float = 0f
-    override var scale: Float = 1f
+    override var mass: Double = 0.0
+    override var scale: Double = 1.0
 
     init {
         itemID = tileNum
-        mass = TilePropCodex.getProp(tileNum).density / 1000f
+        mass = TilePropCodex.getProp(tileNum).density / 1000.0
     }
 
     override fun effectWhileInPocket(gc: GameContainer, delta_t: Int) {