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

Also renamed NazaraUnitTests to UnitTests

tests/UnitTests/Engine/Core/RefCountedTest.cpp

@@ -0,0 +1,30 @@
+#include <Nazara/Core/RefCounted.hpp>
+#include <catch2/catch_approx.hpp>
+#include <catch2/catch_test_macros.hpp>
+
+SCENARIO("RefCounted", "[CORE][REFCOUNTED]")
+{
+	GIVEN("A refcounted persistent")
+	{
+		Nz::RefCounted refCounted;
+		REQUIRE(refCounted.IsPersistent() == true);
+
+		WHEN("We add a reference to this persistent object")
+		{
+			THEN("Number of references should be one")
+			{
+				refCounted.AddReference();
+				REQUIRE(refCounted.GetReferenceCount() == 1);
+				REQUIRE(refCounted.RemoveReference() == false);
+			}
+
+			AND_THEN("We suppress the reference, object is still alive")
+			{
+				refCounted.AddReference();
+				REQUIRE(refCounted.IsPersistent());
+				REQUIRE(refCounted.RemoveReference() == false);
+				REQUIRE(refCounted.GetReferenceCount() == 0);
+			}
+		}
+	}
+}