Doom / PrBoom fixes part 2

[anzz1]

Doom Collection (PrBoom) fixes

• Put IWADs (base data file) in different folders

  • fixes SIGIL and any other PWAD (additional data file) which depend on other IWAD than DOOM2.WAD

• Fix '_required_files.txt'

• Add expansion: Master Levels for Doom II

• Add expansion: No Rest for the Living

• Use official naming scheme for WADs

• Clean up scripts, fix folder structures

• Add MD5 checksums

[schmurtzm]

Hi, there were problems with the upper case naming. It seems that the official naming of Doom files is not respected by PrBoom so many stuffs weren't working in your PR (all the DOOM II extensions for example because DOOM2.WAD doesn't work but doom2.wad is working).

So I have rebuilt the DOOM folder with your ideas :

• Game data files are separated in 4 folders : doom, doom2 , plutonia and tnt as recommended in libretro documentation (each folder can receive optional music in mp3 format).

• DOOM 1 has been removed as it is included in DOOM Ultimate.

• Add expansion: Master Levels for Doom II

• Add expansion: No Rest for the Living

• For the mods, the main wads to have as prerequisite are "doom\doomu.wad" (for Doom 1/ultimate) and "doom2\doom2.wad".

• Mods generally goes in doom2 folder (sometimes in doom folder too).

• Added most fun mods from http://www.doomwadstation.net/main/tc.html#final :

  • Final Fantasy
  • Goldeneye
  • CounterStrike
  • Blood
  • Lego
  • Stardoom
  • Half-Life
  • Fistful of Dollars
  • Simpsons

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Also created 2 PrBoom issues related to this update :
libretro/libretro-prboom#186
libretro/libretro-prboom#187