launcher: add local game patches (#111)

launcher: add game patches

src/loader/gamePatch.h

@@ -0,0 +1,20 @@
+#ifndef KYTY_LOADER_GAME_PATCH_H_
+#define KYTY_LOADER_GAME_PATCH_H_
+
+#include "common/common.h"
+
+#include <filesystem>
+
+namespace Loader {
+
+struct Program;
+
+namespace GamePatch {
+
+bool Apply(const std::filesystem::path& plan_path, Program* program);
+
+} // namespace GamePatch
+
+} // namespace Loader
+
+#endif // KYTY_LOADER_GAME_PATCH_H_