Better Enum diagnostics

[ ] Constructors and Destructors are forbidden.
[ ] Inheritance is not supported. Enums may not extend or be extended.
[ ] Static or object properties are not allowed.
[ ] Cloning an Enum case is not supported, as cases must be singleton instances.
[ ] Magic methods, except for __call, __callStatic, and __invoke, are disallowed.
[ ] Enums must always be declared before they are used.
[ ] enum cases may not be instantiated directly with new

bmewburn / vscode-intelephense