Reorganize tests and benchmark scripts.

Mainly to get rid of one top level directory. But this will
also be useful when there are tests of the embedding API.

test/language/class/name_inside_body.wren

@@ -0,0 +1,14 @@
+class Foo {
+  static sayName {
+    IO.print(Foo)
+  }
+
+  sayName {
+    IO.print(Foo)
+  }
+
+  static toString { "Foo!" }
+}
+
+Foo.sayName // expect: Foo!
+(new Foo).sayName // expect: Foo!

test/language/class/new.wren

@@ -0,0 +1,6 @@
+class Foo {}
+
+var foo = new Foo
+IO.print(foo is Foo) // expect: true
+
+// TODO: Test precedence and grammar of what follows "new".

test/language/class/newline_after_class.wren

@@ -0,0 +1,2 @@
+class // expect error
+Foo {}

test/language/class/newline_after_static.wren

@@ -0,0 +1,6 @@
+class Foo {
+  static // expect error
+  method {} // expect error
+}
+
+// The second error is cascaded.

test/language/class/syntax.wren

@@ -0,0 +1,11 @@
+// Empty body.
+class A {}
+
+// Newline body.
+class B {
+
+}
+
+// No newline after last method.
+class C {
+  method {} }