Overhaul config parsing

* makes plugin config more private:
  The config file now uses sections denoted with [Plugin::Foo] where plugin-
  private config can be stored. Plugins are now passed the usual, as well
  as a hashref for their own config section. They are also passed the config
  section of the core, i.e. those config options not appearing in an explicit
  section. Generally, these are used for bot-global options, so should be
  accessible to all plugins, but plugin-specific config shall be hidden
* tries to improve parsing of hash-like strings and arrays
  The previous mechanism of using regex to pull out possible tokens was only
  ever meant to be temporary, and caused problems with escaping or
  encapsulation inside strings. I have made steps on hash parsing to allow
  tokens inside strings. Both array and hash parsing still to provide an
  escape character to escape the item separator (,)

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