Add dynamic authorization to authstore

The idea is to have allow/deny authorization directives
that are dynamic: their evaluation is deferred until
we perform the authorization checking in allowed?.
This is done to allow replacing backreferences in allow/deny
directives by parameters of the match that selected this right.
For instance, it is possible to:
allow $1.$2
And using Right::interpolate() with the result of a regex match
using 2 captures, will evaluate $1.$2 to those captures.
For instance, if we captured [host, reductivelabs.com], then the
allow directive is replaced by:
allow host.reductivelabs.com
It is then safe to call allowed?, after which we can reset the
interpolation.
This interpolation is thread-safe.

Signed-off-by: Brice Figureau <brice-puppet@daysofwonder.com>

authconfig regex support

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