- Add new checkstyle checks: require Javadoc on large private methods, default in switch, declaration order & others
- Update path exclusions in CodeClimate config to match newly renamed classes (e.g. PHPBB -> PhpBB)
- Create consistency check testing that excluded paths exist as classes
- Fix some trivial violations
- Add easy default methods on PermissionHandler interface (override whenever there's a better way!)
- Change getGroups() signature to return a Collection instead of a List
- Move permission check inside PurgeTask to perform it with OfflinePlayer objects instead of lowercase names
- Move purge members into child "purge" package
- Unify online and offline default permission behavior in DefaultPermission
- Change password validation to return a ValidationResult object for passing message arguments
- Remove wrapping methods in ProcessService and CommandService and use ValidationService directly
- Evaluate permission for DefaultPermission on the enum itself
- Remove boolean default from PermissionHandler for hasPermission()
- Remove some unused / intermediary hasPermission() flavors in PermissionsManager
