[Gtkradiant] [Bug 574] Add spritemodel support to all games, not just Halflife

[gtkradiant@zerowing.idsoftware.com]

http://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=574





------- Additional Comments From ttimo@idsoftware.com  2003-03-11 08:07 -------
copying DoMessageBox from textool is unnecessary, there's an api for that already
m_pfnMessageBox in QERFuncTable. Additionally, the About is inoperant for a
module, only plugins show their commands in the help menu (unless you make your
module export a plugin API too)

add_model_apis is a bit awkwark, usually you'd do this in the synapse client
constructor

please avoid putting comments about what it should do, or what it doesn't do or
what it used to do in the patches (radiant/pluginmanager.cpp). that's confusing

checking in a cleaned up version of the patch. functionality unchanged.
I don't see a major problem with the way we do modelpath atm. At least not
enough to want a redesign. spritemodel sending a list of image formats it
supports is fine.