- allow specifying actor classes whose graphics to precache through MAPINFO.

- some reorganization of texture precaching so that the renderer can decide what to do with actors.

Just marking the sprite textures loses too much info if more is needed than just loading the images into memory.

src/g_mapinfo.cpp

@@ -1083,6 +1083,18 @@ DEFINE_MAP_OPTION(PrecacheTextures, true)
 	} while (parse.sc.CheckString(","));
 }
 
+DEFINE_MAP_OPTION(PrecacheClasses, true)
+{
+	parse.ParseAssign();
+
+	do
+	{
+		parse.sc.MustGetString();
+		//the class list is not initialized here so all we can do is store the class's name.
+		info->PrecacheClasses.Push(parse.sc.String);
+	} while (parse.sc.CheckString(","));
+}
+
 DEFINE_MAP_OPTION(redirect, true)
 {
 	parse.ParseAssign();