[Gtkradiant] [Bug 89] implement Quake 1 support

[Tig]

On Mon, 24 Mar 2003 06:42:28 -0600
bugzilla-daemon@zerowing.idsoftware.com wrote:

<snip>
> with the correct editor configuration. We'll need the quake compile
> tools and a project file with correct bsp-commands, and no shaders.
> 

Some basic editor-based shader support would be great (through
scripts/common.shader). I'm currently using GtkRadiant for Quake editing
(with a map q3 to q1 map convertor). One of the great things this allows
me to do is transparent textures for clips, triggers, water, etc.