[INI] New INI parser

The parser is added to the existing module.
The old parsing functuion will be removed when we
switch to the new interface.

Parser logic:
* There is one high level function that wraps the
  parser interface. It is at the bottom of the module.
  ini_parse_config();
* Internally it creates a perser object
  and then runs parser on it.
* At the end parser object is destroyed.
* This object stores the state of the parser.
* The parser has an action queue
* There are several actions that parser can perform
  - read line
  - inspect read line
  - record an error
  - process last comment in the file (POST)
* Each action handler determines what to do next
  depending upon what has happened.
* Read handler reads lines and enqueues inspection action
  in case of success or error action in case of failure.
* Inspection action parses last read line and
  treats it either is a:
  * Comment
  * Section
  * New key + value
  * Continuation of the value
  In case of error the error action is enqueued.
* Error can be fatal or non fatal. It depend on the error_level
  flag passed in. If the error is non fatal the read action is
  enqueued otherwise parser stops.
* The POST action is a special action to handle comment at
  the bottom of the file. The comment is stored with the
  value it preceeds so in case there is a comment at
  the bottom of the file a special value needs to be created
  to hold just the comment.

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