[Gtkradiant] [Bug 89] implement Quake 1 support

[gtkradiant@zerowing.idsoftware.com]

http://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=89

ttimo@idsoftware.com changed:

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------- Additional Comments From ttimo@idsoftware.com  2003-04-09 17:07 -------
LordHavoc starting work on this.
One important element is that we need to read inside both .wad and .pak files
A new "ARCHIVE" API major needs to be introduced, to access archive formats.
"pk3" "pak" "wad".
The code is already present in the various vfspk3 / vfspak / vfswad
implementations. Need to be abstracted behind an API (probably with a pure
virtual class to abstract the archive object)