v0.1.55-beta

• This is a beta release to find bugs.
• Edit assets under gshtml5-win32-x64/resources/app/assets directory.
• Bugs fixed:
  • Bug with docking pushables fixed.
  • "audio_play" event enhancements: new props: "fade_in", "in_parallel", "bgm_identifier".
  • New "audio_stop" event.
  • Maps now support BGM regions.