Character skill nodes tables

• Tier doesn't work if it is bigger than the ones defined in character_experience_skill_tiers. So normally, set the value lower than 48
• If you want a campaign, subculture, and faction-specific skill node key, define it here. Columns in character_skill_node_sets_tables won't work
• If a character gains an additional skill node via the upper method via confederation, it needs an additional first tick to gain access to it. Same for the startpos character's innate skills