fix: format

[edayot]

A try to format handeling, in the order what the pipeline does :

• assign format to the latest (this is done in Pack.assign_format method, which is automatic at the class creation)
• enter bootstrap
  • if there is a config that specify any format, it overwrite in the pack
  • if no config is found, it check for the minecraft version
  • runs the require section
  • runs the pipeline
  • process overlay format, since they can be created