[Feature] New version of nerve.wad

[Gaerzi]

The Doom+Doom II version of nerve.wad has had some changes again (new UMAPINFO and GAMECONF lump notably).
Its MD5 hash is 23422eb42833ac7b0dd59c0c7ae18a6f, its file size is 4 039 441 bytes. If we load it automatically, we might need to disable the UMAPINFO lump too, or it'll override the definitions for MAP01 to MAP09.