Move ComputeTest,GraphicsTest,RenderTest and Std140Debug to the tests folder

Also renamed NazaraUnitTests to UnitTests

tests/UnitTests/resources.cpp

@@ -0,0 +1,15 @@
+#include <filesystem>
+
+std::filesystem::path GetAssetDir()
+{
+	static std::filesystem::path resourceDir = []
+	{
+		std::filesystem::path dir = "assets";
+		if (!std::filesystem::is_directory(dir) && std::filesystem::is_directory("../.." / dir))
+			dir = "../.." / dir;
+
+		return dir / "tests";
+	}();
+
+	return resourceDir;
+}