[nostalgia/core] Rename event handler to update handler

src/nostalgia/core/event.hpp

@@ -8,10 +8,10 @@ namespace nostalgia::core {
 
 class Context;
 
-using event_handler = int(*)(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 setEventHandler(Context *ctx, event_handler) noexcept;
+void setUpdateHandler(Context *ctx, UpdateHandler) noexcept;
 
 }