[MEDIUM] acl: enforce ACL type checking

[MEDIUM] acl: enforce ACL type checking

ACL now hold information on the availability of the data they rely
on. They can indicate which parts of the requests/responses they
require, and the rules parser may now report inconsistencies.

As an example, switching rules are now checked for response-specific
ACLs, though those are not still set. A warning is reported in case
of mismatch. ACLs keyword restrictions will now have to be specifically
set wherever a better control is expected.

The line number where an ACL condition is declared has been added to
the conditions in order to be able to report the faulty line number
during post-loading checks.