Fuji (Essentials)

Read detailed change logs in https://github.com/sakurawald/fuji/commits/dev/

• [fuji] feature: new /fuji inspect jobs command, to list all registered jobs and their fire dates.
• [fuji] feature: attach jobs registered by this module in its module details GUI.
• [fuji] feature: add document string for all jobs.
• [core] feature: attach detailed exception message for error log.
• [core] feature: capture all exceptions if I/O failed, and provide the details in console.