[svn r56] Initial support for TypeInfo.

Enums not work.
Several other bugfixes.

test/typeinfo.d

@@ -3,4 +3,7 @@ module typeinfo;
 void main()
 {
     auto ti = typeid(int);
+    char[] str = ti.toString();
+    printf("%.*s\n", str.length, str.ptr);
+    assert(str == "int");
 }