Canary10

[stevemessick]

• Define a project type for Flutter projects
• Set it when a project is first opened (handles flutter create ...)
  • In Android Studio the default project type is "Android"
  • In IntelliJ the default is null
• Use it via a chameleon action, defined by XML, to choose the proper Project Structure dialog
• Remove the hack that replaced the original with the custom action
• Update the plugin tool to edit pre-3.5 files before compiling

In addition to the plugin tool file-editing update it needed to be extended a couple other ways. Android Studio just started using *.tar.gz instead of *.zip. The tool handles that by trying one then the other if the first failed. It also uses a new field in product-matrix.json that identifies when a copy should be made of an AS-built plugin to use in IJ. This causes all the supported versions to have a corresponding directory in the release_master directory, as requested by @jacob314. The copy is not made when run in release mode.

@pq @devoncarew