Don't inherit metaclasses.

Also disallow super() in static methods. It won't do anything
useful (it always just delegates to Class) anyway.

test/inheritance/do_not_inherit_static_methods.wren

@@ -0,0 +1,7 @@
+class Foo {
+  static methodOnFoo { IO.print("foo") }
+}
+
+class Bar is Foo {}
+
+Bar.methodOnFoo // expect runtime error: Receiver does not implement method 'methodOnFoo'.

test/inheritance/inherit_static_methods.wren

@@ -1,23 +0,0 @@
-class Foo {
-  static methodOnFoo { IO.print("foo") }
-  static method(a) { IO.print("foo") }
-  static method(a, b, c) { IO.print("foo") }
-  static override { IO.print("foo") }
-}
-
-class Bar is Foo {
-  static methodOnBar { IO.print("bar") }
-  static method(a, b) { IO.print("bar") }
-  static method(a, b, c, d) { IO.print("bar") }
-  static override { IO.print("bar") }
-}
-
-Bar.methodOnFoo // expect: foo
-Bar.methodOnBar // expect: bar
-
-// Methods with different arity do not shadow each other.
-Bar.method(1) // expect: foo
-Bar.method(1, 2) // expect: bar
-Bar.method(1, 2, 3) // expect: foo
-Bar.method(1, 2, 3, 4) // expect: bar
-Bar.override // expect: bar