[sldev] Local textures for fast editing; was: SL 2.0?

[Stickman]

> fairly easy to implement.  I looked on JIRA and the only thing close I saw
> was VWR-14492 "Being able to paint and texture directly onto the prims

http://jira.secondlife.com/browse/VWR-14320

Looks like someone beat me to it by a couple months.

I've modified it a little, since the comments don't seem to notice
it's more than just temporary assets, but a request to auto-update
temporary assets.