This will allow the online editor to load imports from URL asynchroniously later
Since currently the compiler is only working on a single thread, and that we
never await on a future that could block, it is allowed to use the spin_on executor
Currenly, dashes are normalized to '_'.
Dashes are not allowed at the begining of an identifier.
If an identifier with a dash is not found, we also look for identifier
without a dash and if that exist, we hint the user to use spaces.
Issue #52
