[wip] Infernal Immolation - EP.3 replacement (vanilla/-cl3)

•beta v.5•
@e3m1、e3m2
 - some cleanups, few visual redoings and couple of gameplay changes (nothing too big tho)

@general
 - added demos
 - also map titles on .deh (par times.. meh, i simply don't care)

「closing statements」
・tis likely the last update here, next one intends to be the final release on idgames (september is my deadline if everything turns up alright)
・even tho i do have quite a strong health & possess a decent streak of not getting sick (not even a common cold in ~5 years!)
  i've inherited possible heart failure from both sides of my family, so if i ended up dyin' on my sleep, in a layby, on emergency room, etc
  or somehow lose all interest for mapping 'til there; then this might as well be the final thingy
  (i'm wholly satisfied with the current state of this pwad and fine with either outcome)
・shout-out to vigiboi for lettin' me know via essays that merely changing zennode default to 'zero rejects' suffices to make srs work effortlessly
  yes, i do feel a whole lotta stupid for haveth not knowing this beforehandedly
  (oh, and viginode is not being applied on this one - my interest for using your knotmak'r lies on a couple of other projects that're cookin')

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•beta v.4•
@e3m5
 - extra backpack added, so one can have exactly six BFG shots in UV (provided that all scattered cells were collected)
 - mild revamps on three particular setups:
   * "Piper Perri" encounter
     >additional megaarmor after the gangbang (so at very least one can eat a cybbie rocket and live to tell the story on the next arena)
     >cheese spot deprived of its milky properties (thus, no more gas for the lactose intolerant)
     >phalluscat's obsession with penetrating tight spaces on given demos gave me an idea, which was adequately applied

   * Cyberly Cacophonic coliseum
    >adjustments were made to favour a more comfy monster infighting spectacle (if entertaining the masses is most desirable)
   
   * Gimmicky rockety exit
    >straightaway improved, hence, its emphatically consistent (also possible to exit the map when nomo-ing now, who foolish plays that way though?)