CRM-20926 - CRM_Core_IDS - Generate configuration from an array

CRM-20926 - CRM_Core_IDS - Generate configuration from an array

Background
==========

PHPIDS scans all inputs and uses heuristic checks to identify malicious
content.  It relies on a configuration with data about the fields we'll
process.

Before
======

The function `createConfigFile()` produces the standard configuration as an
INI file.  The configuration was represented as an unalterable string.

After
=====

 * The configuration is represented as an array.
 * The configuration is generated via `createStandardConfig()`
 * The function `createConfigFile()` only handles file I/O.