Complete transition to fn. Introduce global/threadlocal

test/test_suite/methods/enum_distinct_err_methods.c3t

@@ -16,21 +16,21 @@ enum MyEnum
     B
 }
 
-func void Foo.hello(Foo *f)
+fn void Foo.hello(Foo *f)
 {
     io::println("Hello from Foo");
 }
 
-func void Bar.hello(Bar *b)
+fn void Bar.hello(Bar *b)
 {
     io::println("Hello from Bar");
 }
 
-func void MyEnum.hello(MyEnum *myenum)
+fn void MyEnum.hello(MyEnum *myenum)
 {
     io::println("Hello from MyEnum");
 }
-func void main()
+fn void main()
 {
     Foo f;
     Bar b;