Sensible Structure Tweaks

Makes a few tweaks to structures that ... just make sense! The idea is simple: Integrating content where it makes sense. "If mojang added igloos now, they wouldn't be limited to just using snow blocks." "If trial chambers have strays and husks, why not parched and frostbites?"

If you're looking for some other reasonable updates that integrate newer content with older content better, like shelf mushrooms generating in dark forests, or jungle saplings dropping at the same rate as other saplings... check out other datapacks. This is only for structures.
Misc:

• Pillager Outpost tents use wool stairs/slabs where appropriate
• Igloos use Snow Bricks (and now that they CAN, they use some slabs)
• One VERY specific campsite structure containing a destroyed igloo uses a few snow bricks now

Village house changes

• Snowy Village houses that use Snow or Ice blocks now use the appropriate bricks (and use slabs)
• Snowy Village town centers now contain a few Ice Crystals
• Replaced instances of raw Diorite in snowy villages with Polished Calcite

Trial chambers:

• Parched and Frostbites are part of the pool of possible Trial Spawners (Frostbite spawn more often with Ice Balls if Ominous)
• Stray Trial Spawners are marked with chiseled packed ice now, as Frostbite are marked with normal packed ice
• Replaced most instances of Iron Chains with Copper Chains

This pack may be incompatible with trial chamber reworks, due to changing the definition of the structure for the new trial spawners to spawn. Untested

TODO:

• Replace trial chamber chests with copper chests?
• Igloo variant with brittle ice under the carpet?