- cleanup of font init to have less special cases

To make things easier, DBIGFONT, SBIGFONT and HBIGFONT will now be renamed in the lump directory to make things a bit easier to handle.

Another change is to make font folders atomic units to prevent cross-pollution between incompatible fonts. The only exception to this are the def* folders because they need to piece together their fonts from both zd_extra.pk3 and the IWADs.

src/menu/menudef.cpp

@@ -404,7 +404,7 @@ static void ParseListMenuBody(FScanner &sc, DListMenuDescriptor *desc)
 						}
 						else if (args[i] == TypeFont)
 						{
-							auto f = FFont::FindFont(sc.String);
+							auto f = V_GetFont(sc.String);
 							if (f == nullptr)
 							{
 								sc.ScriptError("Unknown font %s", sc.String);