lightirc: major changes

* Update pircbotx to latest and rename
* Massive cleanups all over the shop including on strings, xml files,
code etc.
* Rename a lot of stuff to make it much more understandable
* Change way servers are read from prefs file - breaks old data (but
hey...)
* Remove a lot of dead code
* Add copyrights
* Change parsing of text from Broadcasts to method calls
* Make compatible with pre API 16 - all the way back to ICS
* Move thins around to make it clearer