VideoCommon: add resource manager and new asset loader; the resource manager uses a least recently used cache to determine which assets get priority for loading. Additionally, if the system is low on memory, assets will be purged with the less requested assets being the first to go. The loader is multithreaded now and loads assets as quickly as possible as long as memory is available

Co-authored-by: Jordan Woyak <[email protected]>

Source/Core/VideoCommon/CMakeLists.txt

@@ -13,6 +13,8 @@ add_library(videocommon
   Assets/CustomAssetLibrary.h
   Assets/CustomAssetLoader.cpp
   Assets/CustomAssetLoader.h
+  Assets/CustomResourceManager.cpp
+  Assets/CustomResourceManager.h
   Assets/CustomTextureData.cpp
   Assets/CustomTextureData.h
   Assets/DirectFilesystemAssetLibrary.cpp