[REQ] generic config struct for parameter value lists

Hi list,

I have some good input on extending Kannel's config handling abilities:

Currently we have several needs for a config value list, some examples:

   group = smsc
   ...
   accepted-smsc-id = "A;B;C"

   group = sms-service
   ...
   aliases = "key2;key3;key4"

   group = smsbox-route
   ...
   shortcode = "1111;2222;3333"

so, all of these are either of type word-list or id-list, semantically it's a 
semicolon seperated list. For some parts we have defined foobar-regex config 
directives to handle PCRE/regex for a more simple definition.

The idea now is to create a more generic construct for this, which handles 3 
(maybe more?) different ways for any "list-type":

   foobar = "A;B;C"
   foobar-url = "http://somewhere/foobar-list"
   foobar-regex = "<the regex expression>"

so users can *CHOOSE* which way they prefer. And we handle the processing of the 
list "transparently" to the logic that requires the list from the config sections.

I like this concept of abstraction here. Since we would encapsulate the plain, 
-url and -regex handling to the scope of gwlib/cfg.{ch] and the other calling 
modules simply pull for the list.

Thoughts?

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