WIP collision solver, colour-codes in game fonts

Former-commit-id: 0bb85999176d89956398bbcc24e1b33cacd3e87c
Former-commit-id: 0ef0c1ac9b88f8fe42a7439fee69a8d4792be96a

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

@@ -15,7 +15,7 @@ class PhysTestBall : ActorWithBody {
     constructor(): super() {
         setHitboxDimension(16, 16, 0, 0)
         isVisible = true
-        mass = 10f
+        actorValue[AVKey.BASEMASS] = 10f
 
         color = RoguelikeRandomiser.composeColourFrom(RoguelikeRandomiser.POTION_PRIMARY_COLSET)
     }
@@ -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,
+                hitbox.posY,
+                hitbox.width,
+                hitbox.height)
     }
 }