Revised NewConfiguration API and more

This release includes a revised API for creating new configurations via Manager.NewConfiguration() that allows QuorumSpec and NodeListOption types be added in any order. The release also allows to create a configuration with additional nodes via Configuration.WithNewNodes and excluded via Configuration.Without, and there is also Configuration.And and Configuration.Except that operates on Configuration objects.

Other changes:

• Replaced deprecated golang.org/x/tools/go/loader with golang.org/x/tools/go/packages in gorums_bundle.go for a significant speed boost.
• Fixed bug in dependency handling due to missing generated files.
• Improved version handling.
• Upgraded all dependencies to the most recent version and tested.
• Documentation and user guides have been updated