This removes the extra space when generating field expressions, function
statements (like `Table0.fun`) and types using namespaces when the 
identifier before the `.` symbol ends with a number.

Add a `except` parameter to the `remove_comments` rule to make
it possible to avoid removing `--!native` comments for example.

These changes fixes the `remove_unused_variable` rule by removing the
variables in the right order and fixing the scoping issue with repeat
statements.