"Standart" misspelling in BattleUnitAnimationPack and many other locations #1680

As detailed in #1677 and in relation to PR #1679

standart_animations, a BattleUnitAnimationPack member with around 200 uses across the animation pack code and the extractors, plus some prose in tools/extractors/docs/tactical.txt.

That one is not a cosmetic rename. The serialization codegen uses the name from gamestate_serialize.xml both as the generated C++ field name and as the literal save-file section key, so the string reaches disk as getSection("standart_animations"). Renaming it would orphan that section in every existing save unless a compatibility shim is added.

So it needs a decision rather than a patch: accept the save break, add a fallback that reads the old key, or leave the misspelling in place. Happy to file it as its own issue and implement whichever way you prefer, just did not want to bundle a save-compatibility change into a cosmetic rename.