refactor all common parts and games

common/util/slurp.h

@@ -0,0 +1,12 @@
+#include <stdbool.h>
+/*
+ * 'slurp' reads the file identified by 'path' into a character buffer
+ * pointed at by 'buf', optionally adding a terminating NUL if
+ * 'add_nul' is true. On success, the size of the file is returned; on
+ * failure, -1 is returned and ERRNO is set by the underlying system
+ * or library call that failed.
+ *
+ * WARNING: 'slurp' malloc()s memory to '*buf' which must be freed by
+ * the caller.
+ */
+long wslurp(const wchar_t* path, char **buf, bool add_nul);