Make Vulkan class a global instance

CopiumEngine/src/copium/sampler/Sampler.h

@@ -1,6 +1,5 @@
 #pragma once
 
-#include "copium/core/Vulkan.h"
 #include "copium/util/Common.h"
 
 #include <vulkan/vulkan.hpp>
@@ -11,10 +10,9 @@ namespace Copium
   {
     CP_DELETE_COPY_AND_MOVE_CTOR(Sampler);
   protected:
-    Vulkan& vulkan;
     VkSampler sampler;
   public:
-    Sampler(Vulkan& vulkan);
+    Sampler();
     virtual ~Sampler();
 
     virtual VkDescriptorImageInfo GetDescriptorImageInfo(int index) const = 0;