Introduce an Event system to VideoCommon

A lot of the remaining complexity in Renderer is the massive Swap function
which tries to handle a bunch of FrameBegin/FrameEnd events.

Rather than create a new place for it. This event system will try
to distribute it all over the place

Source/Core/Common/StringLiteral.h

@@ -0,0 +1,17 @@
+// Copyright 2023 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <algorithm>
+
+// A useful template for passing string literals as arguments to templates
+// from: https://ctrpeach.io/posts/cpp20-string-literal-template-parameters/
+template<size_t N>
+struct StringLiteral {
+  consteval StringLiteral(const char (&str)[N]) {
+      std::copy_n(str, N, value);
+  }
+
+  char value[N];
+};