[nostalgia] Break part of core out into Turbine and TeaGBA libraries

src/turbine/event.hpp

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2016 - 2023 Gary Talent (gary@drinkingtea.net). All rights reserved.
+ */
+
+#pragma once
+
+namespace turbine {
+
+class Context;
+
+using UpdateHandler = int(*)(Context&);
+
+// Sets event handler that sleeps for the time given in the return value. The
+// sleep time is a minimum of ~16 milliseconds.
+void setUpdateHandler(Context &ctx, UpdateHandler) noexcept;
+
+}