- disable texture name truncation for textures/ directory.

Unlike Doom, a similar limit does not exist here and must not be enforced. Any texture from this folder needs to be usable by its full name without extension to be able to replace named tiles.

source/core/gamecontrol.cpp

@@ -886,6 +886,7 @@ void GetGames()
 
 static void InitTextures()
 {
+	TexMan.usefullnames = true;
 	TexMan.Init([]() {}, [](BuildInfo&) {});
 	StartScreen->Progress();
 	mdinit();