Fix gamma rendering issues

- Remove gamma correction from the Vulkan renderer
- Add SamplerCreator, used to specify Min/Mag filter
- Add character texture to example project
- Add AnimationSystem, DebugSystem and UiRenderSystem to example project

CopiumEngine/src/copium/core/Vulkan.cpp

@@ -13,6 +13,7 @@ namespace Copium
   std::unique_ptr<Window> Vulkan::window;
   std::unique_ptr<Device> Vulkan::device;
   std::unique_ptr<SwapChain> Vulkan::swapChain;
+  AssetHandle Vulkan::emptyTexture2D;
 
   void Vulkan::Initialize()
   {
@@ -30,10 +31,12 @@ namespace Copium
     // TODO: Make the working directory always be relative to the assets folder
     //       By looking at where the executable is, since that should always be in the bin folder (it currently isn't though)
     AssetManager::RegisterAssetDir("assets/");
+    emptyTexture2D = AssetManager::RegisterRuntimeAsset("empty_texture2d", std::make_unique<Texture2D>(std::vector<uint8_t>{0, 0, 0, 255}, 1, 1, SamplerCreator{}));
   }
 
   void Vulkan::Destroy()
   {
+    AssetManager::UnloadAsset(emptyTexture2D);
     AssetManager::UnregisterAssetDir("assets/");
     AssetManager::Cleanup();
     swapChain.reset();
@@ -62,6 +65,11 @@ namespace Copium
     return *swapChain;
   }
 
+  AssetHandle Vulkan::GetEmptyTexture2D()
+  {
+    return emptyTexture2D;
+  }
+
   bool Vulkan::Valid()
   {
     return instance && window && device && swapChain;