feat: update engine features

- WIP start/stop methods
- Remove test module

src/engine/core/engine.cpp

@@ -49,11 +49,38 @@ MscEngine::MscEngine(std::vector<std::shared_ptr<MscEngineModule>> modules)
             std::to_string(current_rev));
       }
     }
+
+    module.get()->onInitialize(*this);
   }
 
   _modules = std::move(modules);
 }
 
+void MscEngine::start()
+{
+  if (_isRunning)
+    return;
+
+  _isRunning = true;
+  _lastUpdate = clock::now();
+
+  double accumulator = 0.0;
+  constexpr double fixedDt = 1.0 / 30.0;
+
+  while (_isRunning)
+  {
+    //
+  }
+}
+
+void MscEngine::stop()
+{
+  if (!_isRunning)
+    return;
+
+  _isRunning = false;
+}
+
 MscEventBus &MscEngine::getBus()
 {
   return _bus;