Update to 1.4

A brief selection of highlights since v1.3.1:
* URL and email detection in text views has been rewritten from scratch, greatly
  improving the handling of various types of URLs and the contexts they might
  appear in.
* Extensive improvements to IRC formatting code handling, including the return
  of background color support.
* Extensive, sometimes full rewrites of user interface elements such as nearly
  all context menus, the URL Catcher and the Warning Dialogs system for a long
  list of user interface improvements and bug fixes.
* Improved SSL connection behavior.
* Translation support and various other improvements in several bundled scripts.
* Expanded Python scripting support via the introduction of an API support
  package.
* Support for more IRC numerics.
* Various bugfixes to input line command handling and connection behavior.

(markd)