[sldev] Patch - Line history for chat lines

[Tofu Linden]

Zi Ree wrote:
> Hi Second Life Developers!
> 
> When the viewer first became open source I wrote a small patch for it to 
> implement a chat line history, so you can recall your previously written 
> lines. Now with the SVN repository in place I thought it would be a good idea 
> to adapt it to the new code base and put it up on the Jira for you to review 
> and use.
> 
> Jira entry: https://jira.secondlife.com/browse/VWR-671

Nice - committed, thanks!

- Tofu