[Gtkradiant] Enhanced Texture Browser (reworked, diff included)

[Shaderman]

Hi!

I had already sent a patch regarding better handling of the texture 
viewer to this list in May.

I was talking with SPoG some days ago and made some changes to the first 
patch:

- I dropped the buttons on top of the texture viewer. There's a menu bar 
instead for functions like "Hide Unused", "Flush & Reload Shaders" and 
so on.
- The dialog window "Directory List" is removed

This patch is for revision 91 and was tested with Enemy Territory, Quake 
4 and Quake 1 (.wad file support).

Shaderman
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