Fix retry issue with actors (#669)

* Update World.h

* Update World.cpp

* Update Game.cpp

src/engine/World.cpp

@@ -273,3 +273,10 @@ void World::CleanWorld(void) {
     Lakitus.clear();
     Sky::Instance->GetSkyActors().clear();
 }
+
+void World::CleanActors(void) {
+    World::Reset();
+    Actors.clear();
+    Lakitus.clear();
+    Objects.clear();
+}

src/engine/World.h

@@ -103,6 +103,7 @@ public:
 
     World* GetWorld(void);
     void CleanWorld(void);
+    void CleanActors(void);
 
     // getter/setter for current track
     Track* GetTrack() {

src/port/Game.cpp

@@ -366,7 +366,7 @@ void CM_DrawStaticMeshActors() {
 void CM_BeginPlay() {
     static bool tour = false;
     auto track = GetWorld()->GetTrack();
-    GetWorld()->Actors.clear();
+    GetWorld()->CleanActors();
     
     if (nullptr == track) {
         return;