- 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.

# Conflicts:
#	src/gamedata/fonts/v_font.cpp

src/v_font.cpp

@@ -3599,7 +3599,7 @@ void V_InitFonts()
 	}
 	if (!(SmallFont2 = V_GetFont("SmallFont2")))	// Only used by Strife
 	{
-		if (Wads.CheckNumForName ("STBFN033", ns_graphics) >= 0)
+		if (Wads.CheckNumForName("STBFN033", ns_graphics) >= 0)
 		{
 			SmallFont2 = new FFont("SmallFont2", "STBFN%.3d", "defsmallfont2", HU_FONTSTART, HU_FONTSIZE, HU_FONTSTART, -1);
 		}
@@ -3610,12 +3610,18 @@ 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");
+	}
+
 	// let PWAD BIGFONTs override the stock BIGUPPER font. (This check needs to be made smarter.)
 	if (BigUpper && BigFont->Type != FFont::Folder && BigUpper->Type == FFont::Folder)
 	{