* Disable 'Show Excluded' by default
* Move .iml file inside .idea dir
* Remove pub and build excludions as they are automatically set by the Dart plugin
* Exclude .idea folder (new users will edit it through the IJ UI, not the file)
* Move .iml files into .idea dir to be consistent with template changes
* Add workspace.xml from new template to existing samples
* Update current examples to match template changes for excluding folders
* Add missing flutter.yaml to make sure there are no analysis errors
* Add back .pub and build excludeFolder tags per https://github.com/flutter/flutter-intellij/issues/630#issuecomment-272887230
* Remove workspace.xml from example per review feedback