[sr-dev] [kamailio/kamailio] dialplan: implement Iterative dialplan matching (#764)

From http://lists.kamailio.org/pipermail/sr-dev/2016-August/036231.html

Hi, When translating strings with the dialplan module, you sometimes end up with very complex patterns for sanitizing the target string and performing some replacements, since for a given dialplan id, processing stops on the first match within the dialplan entries for a given dpid. The idea is to introduce a "continue" flag (default 0) in the dialplan table indicating to proceed with processing further dialplan entries within the given dpid after a match. The use case is to have a sanitize rule with highest priority which e.g. removes any spaces, dashes and parentheses from the target string, then with a lower priority do further processing with the cleaned up string, e.g. stripping leading double-zeroes or a plus when normalizing to E164 numbers, or replacing a single leading zero with the country code and so on. This is particularly useful when a user dials a number from an address book of some sort (e.g. on a mobile app) where number formats are stored with country-specific formating characters like "+1-(234)-567 890", and catching all of that in one rule results in really messy match/replace patterns.