docs(infestations): spawn distance, lure takeover and summon counting

[Drefvelin]

Documents TF-Minecraft/Infestations#4:

• min-player-distance: no ambient or lure spawn within it of a player; the ambient ring and lure ring minimums are raised to it.
• Spot search uses capped random sampling in loaded chunks only.
• On activation, roaming ambient mobs become lure mobs and count toward lure-count.
• Mobs summoned by dying infestation mobs (parasitic worms) inherit tags and add to the remaining count during a lure.
• Victory waits two seconds after the count reaches zero.
• Validation steps for these.

check-indexes.py and the script unit tests pass.

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