Used the trip back from CeBIT to prepare everything for a huge

let's-rewrite-the-ChatWidget action...

* ChatLine -> ChatLineOld
* Added ChatItem, -Line, -Scene, -View to the build system again
* #define SPUTDEV -> Global::SPUTDEV and ./quasselclient --sputdev
* Started some random hacking in the ChatView related sources

Disclaimer: DO NOT USE --sputdev, it might eat your babies (and does
            not look good anyway yet :P)