Rework ECS framework

- Add queue systems when adding/removing components and systems
- Add GlobalData to ECSManager, used to store data that is not specific
  to entities
- Add View class, used to for loop all entities that contains the given
  Components
- Rework how signaling works

CopiumEngine/src/copium/ecs/SystemOrderer.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <typeindex>
+#include <vector>
 
 namespace Copium
 {
@@ -8,27 +9,37 @@ namespace Copium
 
   class SystemOrderer
   {
-  private:
-    std::type_index systemId;
-    SystemPool* systemPool = nullptr;
-
   public:
     SystemOrderer(std::type_index systemId, SystemPool* systemPool);
 
-    template <typename Other>
+    template <typename System>
     void Before()
     {
-      Before(typeid(Other));
+      orderQueue.emplace_back(OrderOperation::Before, typeid(System));
     }
 
-    template <typename Other>
+    template <typename System>
     void After()
     {
-      After(typeid(Other));
+      orderQueue.emplace_back(OrderOperation::After, typeid(System));
     }
 
   private:
-    void Before(const std::type_index& otherSystemId);
-    void After(const std::type_index& otherSystemId);
+    enum class OrderOperation
+    {
+      Before,
+      After
+    };
+
+    std::type_index systemId;
+    SystemPool* systemPool = nullptr;
+    std::vector<std::pair<OrderOperation, std::type_index>> orderQueue;
+
+  private:
+    friend class SystemPool;
+
+    void CommitOrdering();
+    void CommitBefore(const std::type_index& otherSystemId);
+    void CommitAfter(const std::type_index& otherSystemId);
   };
 }