D1953 standardizes the formatting style of the technologies json files. This one does the same for auras. Changes:
* use tabs for indentation, not (two) spaces
* alphabetize modifications, except for damage types and resources, which have a fixed order (hack, pierce, crush and food, wood, stone, metal, time, xp, respectively)
* remove unnecessary trailing zeroes
* aura descriptions per https://trac.wildfiregames.com/wiki/EnglishStyleGuide :
* B.C. → BC
* HP → health
* the Meroë Empire → Kush
* proper quotation marks inside `wonder_pop_2.json` description
* [EDIT]: proper minus signs
* [EDIT]: render `"ResourceGatherer/BaseSpeed"` as "gather speed"
* [EDIT]: replace unnecessary verbose "25% less" with "−25%" for consistency