[nostalgia/core] Add Context buttonDown function

src/nostalgia/core/input.hpp

@@ -20,7 +20,9 @@ enum Key {
 	GamePad_L      = 512,
 };
 
+class Context;
+
 [[nodiscard]]
-bool buttonDown(Key) noexcept;
+bool buttonDown(Context *ctx, Key) noexcept;
 
 }