Tweaked the aforementioned lineages to be more consistent

Allowed Scavenger numbers for the new version of Pilgrims' Ascent to be reduced.

-Added Safari icons for Aqueducts and Forlorn Valley
-Properly-sized thumbnails for Secluded Pass arenas
-Present-GW palette restored for Challenge 46
-Removed most threat layers from The Surface and Shattered Terrace
-New Ultrakill subtitles for Silent Construct, Spearmaster's Acerbic Station, Rotten City, and Fading Expanse (some reordering for Metropolis and Five Pebbles)
-Spearmaster Safari and removed "Garden" track for Lunar Aerie
-Updated Submerged Superstructure-Lunar Aerie passage to be somewhat easier to pass
-Removed a couple pre-Rivulet Lunar Aerie Blue Fruit from where the Monster Kelp would touch
-Forced normal MS_MEM06 and slightly-bluish MS_FARSIDE, overriding a merging mod
-Saint Safari for Forlorn Valley
-Metropolis Safari invariably allows Survivor, Monk, and Rivulet
-Normal names restored for Rivulet's Industrial Complex and Pipeyard
-New palettes for Grid, Thrones, Islands, and Dark Tower arenas
-Edits of music triggers for legacy Aether Ridge
-Changed unlock token worldstates: Bubble Weed for Monk, Survivor, and Gourmand; Brother Long Legs not for Artificer; Eel Lizard for Monk or Rivulet; no Salamander in Undergrowth; no Yellow Lizard in Infected Underhang
-Patched spawns for Gilded Sanctuary
-Non-DLC scugs for Purple Swamplands Safari (dunno why that place's so nostalgic to me)
-Placed some Wolf Spiders in mid-timeline Leg, and Survivor's spawns for Gourmand's Leg-Underhang intersection
-Some fairly threatening creatures can be lineaged easier in Outskirts
-Improved some Yellow Lizard lineages in "Citadel"
-Replaced a Miros Vulture with a Vulture in Glacial Wasteland
-Fixes to Less Caramels spawns: Monk's Chimney Canopy and Garbage Wastes have Greens replace smaller lizards, fixed precycle spawns for Desolate Fields, separated late-Outskirts Dropwig spawns

-Better palettes for Grid, Acid Fields, Islands, and Array's Challenge version
-Compatibility with Timeline World Corrections' Submerged Superstructure ("Random Fate" appears for Saint's worldstate)
-Rivulet's MS_FARSIDE has very light rain and has bluish water to fit the wet season
-Lizard Customizer folder has Caramel Lizards be a tad less obese and lunge horizontally
-Reduced Dropwigs in hardmode Outskirts and Drainage System
-Tweaked Farm Arrays so Gourmand has another Blue Lizard, and Desolate Fields feels a bit more empty
-Moved a herd of Yellow Lizards from Rivulet's Chimney Canopy to Saint's
-Put one Vulture and one Leviathan in Gourmand's Shoreline
-Allowed an Elite Scavenger to appear in Artificer's Industrial Complex and Acerbic Station
-Fixed a Sunlit Port track
-Removed the trigger from Glacial Wastelands' passage near Pilgrim's Ascent
-Added rounded Pilgrim's Ascent Safari icon, and better menu background panning
-Edited Hunter's description to hide the fact that its days are numbered
-Fixed a Pilgrim's Ascent room near Acerbic Station
-Fixed up Scorched District's map so Distillation Column is a Spearmaster-only name
-Rotten City now lacks a rain timer
-Fixed up Shoreline's "Gate to the Shoreline" trigger from Shaded Citadel
-Added nighttime wall lizards and a white lizard to Pilgrim's Ascent
-Patched up Ashen Monolith properties to be sure that the Eel Lizard stays underground

Fixed up the Fading Expanse threat music, and the introduction popups appearing early in the Humid Fields.

-Improved region art layers for Lush Mire. I hope.
-Improved subregion names for the main Grinder
-Fixed map gate icons for the Grinder, via SWAPMAPSYMBOL
-Reduced awkward Strawberry Lizard placements late in The Mast
-Changed the Immersed Struts theme to "Ascent"
-Diurnal blue lizards in place of Fading Expanse's new white lizards; that villa's full of awkward places to perch
-Added precycle spawns and flooded rooms for Fading Expanse, and expanded the scope of the Humid Fields area

-Metropolis and Outer Expanse safaris accessible as Rotten City and Fading Expanse
-Drainage System room no longer blocks Lush Mire access (initially meant for non-Downpour users)

-Use of optional but prioritized mods! Happy new year!
-Tweaks for Badlands and The Mast
-Improved tweaks for Submerged Superstructure and Metropolis
-Path between Submerged Superstructure & Bitter Aerie accessible (though hidden) for all Slugcats

There's no more incompatibility between EXSU and Fading Expanse, and forcing the latter's SU_A23 exit layout wasn't helping at all.

Fixed a bug where Silent Construct's "Dimmed Grotto" subregion name wasn't displayed for the designated rooms.