Physics stuff Float -> Double

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

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

@@ -23,9 +23,9 @@ class PhysTestBall : ActorWithBody {
     override fun drawBody(gc: GameContainer, g: Graphics) {
         g.color = color
         g.fillOval(
-                hitbox.posX,
-                hitbox.posY,
-                hitbox.width,
-                hitbox.height)
+                hitbox.posX.toFloat(),
+                hitbox.posY.toFloat(),
+                hitbox.width.toFloat(),
+                hitbox.height.toFloat())
     }
 }