- moved several IWAD dependent files into the game_support resource

* sprite offset definitions, which are IWAD dependent
* Freedoom's decal overrides
* conversation ID definitions for the Strife teasers
* the fallback BigFont now can also be loaded by IWADs which declare themselves as GAME_Heretic or GAME_Hexen.

src/gamedata/fonts/v_font.cpp

@@ -1583,11 +1583,17 @@ void V_InitFonts()
 
 	if (!(BigFont = V_GetFont("BigFont")))
 	{
-		if (gameinfo.gametype & GAME_Raven)
+		if (Wads.CheckNumForName("FONTB_S") >= 0)
 		{
 			BigFont = new FFont("BigFont", "FONTB%02u", "defbigfont", HU_FONTSTART, HU_FONTSIZE, 1, -1);
 		}
 	}
+	
+	if (!BigFont)
+	{
+		// Load the generic fallback if no BigFont is found.
+		BigFont = V_GetFont("BigFont", "ZBIGFONT");
+	}
 
 	if (gameinfo.gametype & GAME_Raven)
 	{