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/Channel/GameObjects/Items/RubeDoll.js

@@ -56,10 +56,10 @@ function (Parent, Settings, nc) {
 
         for(var name in this.limbs) {
             limbUpdateData[name] = {
-                p: this.limbs[name].GetPosition(),
-                a: this.limbs[name].GetAngle(),
-                lv: this.limbs[name].GetLinearVelocity(),
-                av: this.limbs[name].GetAngularVelocity()
+                p: this.limbs[name].getPosition(),
+                a: this.limbs[name].getAngle(),
+                lv: this.limbs[name].getLinearVelocity(),
+                av: this.limbs[name].getAngularVelocity()
             };
         }
         updateData['limbs'] = limbUpdateData;