[sldev] Various questions on the viewer.

[Jason Giglio]

1. Why does zoom transform into FOV zoom when you are closer than the 
(fairly large) MIN_ZOOM threshold?  That makes working on small prims a 
real bitch.  Can we lower MIN_ZOOM safely?

2. Why are all the Observer patterns used in the client so simplistic? 
Is this a design decision?  It seems they all only get a bitmask 
parameter on the changed() event.  Why can't we pass them more complex 
data structures so that things like the entire UI could be turned into 
Observer patterns?

3. What are the proper ways to use the XUI?  Why do some floaters use 
hidden "text" types for things that are really just misc strings?  Why 
not use the much easier getUIString?

I see a whole lot of inconsistancy in the way the XUI is used.  What is 
the right way?  Where are we going with this?