Added "dry_habitability", "wet_habitability", and "cold_habitability" modifiers.

Separated out some stuff from the Aquatics trait

• Moved triggered modifiers present on all capital buildings into the inline script "capitals/standard_colony_modifiers", and those present on both habitat capitals into "capitals/standard_habitat_modifiers", so that adding such modifiers doesn't require overwriting the entire capital building definitions
• Added the inline script "job_groups/civic_capital_jobs" to allow additional politician-replacement jobs like High Priests and Head Researchers to be added without overwriting the entire capital building definitions
• Added numerous inline scripts in a subfolder "job_groups" to allow additional job replacements such as Artificers-instead-of-Artisans or Catalytic-Drones-instead-of-Alloy-Drones can be added without overwriting every object that adds the relevant type of job.
• Added a scripted variable "@TRADITION_CATEGORIES_MAX" that allows the number of traditions at which ascension paths are disabled to be changed without overwriting the ascension paths themselves.