fvm 2.0.0-dev.6

• Feature: Environments - Set Flutter sdk versions per project environment. - Feature: Which - Easily view the Flutter version configure for the project and it's state - Feature: Spawn - Easily proxy Flutter commands through any cached version - Improvements: Global - Create own command to set global versions. Deprecated "--global" flag. - Improvements: Flutter command proxy now defaults to FVM global configured version before looking for one configured on PATH - Improvements: Better error messaging, notifications and logging - Improvements: Many quality of life improvements

See the full changelog for changes in earlier releases.