Update checkstyle config and CodeClimate exclusions

- 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

src/main/java/fr/xephi/authme/settings/EnumSetProperty.java

@@ -12,6 +12,8 @@ import static com.google.common.collect.Sets.newHashSet;
 
 /**
  * Property whose value is a set of entries of a given enum.
+ *
+ * @param <E> the enum type
  */
 public class EnumSetProperty<E extends Enum<E>> extends Property<Set<E>> {