Complete Box2D to Planck.js migration

- Replace Box2D.js with Planck.js physics engine
- Update all require paths from 'Lib/Vendor/Box2D' to 'Lib/Vendor/Planck'
- Convert Box2D contact listeners to Planck.js event system
- Fix all method name capitalization (Get* -> get*, Set* -> set*)
- Update collision detection system for Planck.js compatibility
- Server now starts successfully and basic physics working
- Character can land on platforms - core physics functional

Major milestone: Game now running on modern, maintained physics engine

app/Game/Client/GameController.js

@@ -1,6 +1,6 @@
 define([
     "Game/Core/GameController",
-    "Lib/Vendor/Box2D",
+    "Lib/Vendor/Planck",
     "Game/Client/Physics/Engine", 
     "Game/Client/View/ViewManager", 
     "Game/Client/Control/PlayerController", 
@@ -49,6 +49,7 @@ function (Parent, Box2D, PhysicsEngine, ViewManager, PlayerController, nc, reque
 
         this.animationRequestId = requestAnimFrame(this.update.bind(this));
         this.physicsEngine.update();
+        this.physicsEngine.renderDebug(); // Render Planck.js debug draw
         
         if(this.me) {
             this.me.update();