Support XBOX version of Doom
I did some testing with DOOM.WAD and IWADConverter. I converted doom.wad to the XBOX version. It contains a new secret map E1M10 "SEWERS". There is a new exit in E1M1 to this map but in many ports (including doomsday) that exit sends the player to E1M9. Crispy Doom works as expected in that matter, Then the exit from E1M10 should send player to E1M2 (instead of E1M! as it happens in some source ports).
Another issue (not tested by me yet), according to IWADconverter is
"- E4M1 is modified so that the player
is unable to lower the rectangular
structure hiding the "NIN" logo.
Thus one cannot get 100% kills and
secrets on E4M1 with this version."
I would be very nice if doomsday can handle these issues.
Needs a new game mode (doom1-xbox) and suitable Episode definition(s).