ex_getln: Refactor script_get()

1. Use `char *` for strings.
2. Add `const` qualifiers.
3. Add attributes and documentation.
4. Handle skipping *inside*.
5. Handle non-heredoc argument also inside: deferring this to the caller is
   pointless because all callers need the same thing. Though new ex_lua caller
   may live without allocations in this case, allocating nevertheless produces
   cleaner code.
6. Note that all callers call script_get with `eap` and `eap->arg`. Thus second
   argument is useless in practice: it is one and the same always and can be
   reached through the first argument.

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