parser: allow to define maps that contain timeouts and expectations

parser: allow to define maps that contain timeouts and expectations

Its currently not possible to use ct timeouts/expectations/helpers
in objref maps, bison parser lacks the relevant keywords.

This change adds support for timeouts and expectations.
Ct helpers are more problematic, this will come in a different change.

Support is only added for the "typeof" keyword, otherwise we'd
need to add pseudo-datatypes as well, but making "ct expectation"
available as "type" as well might be confusing.

Signed-off-by: Florian Westphal <fw@strlen.de>