Add option --window-title

Add an option to set a custom window title.

Signed-off-by: Romain Vimont <rom@rom1v.com>

app/src/scrcpy.h

@@ -9,6 +9,7 @@ struct scrcpy_options {
     const char *serial;
     const char *crop;
     const char *record_filename;
+    const char *window_title;
     enum recorder_format record_format;
     uint16_t port;
     uint16_t max_size;