Itm 475 more updates

[kaitlyn-sharo]

• Update to latest swagger YAML and sample YAML on itm-evaluation-server's development branch.
• Update for treatment counts:
  • treatments_applied == 0 or treatments_applied == treatments_required
  • status is NOT "partially_treated"
• If unseen is True, then none of the vitals for that character are required
• All of the Conditional Requirements rules involving actions (e.g., APPLY_TREATMENT) are now warnings instead of errors.
• Updates for unseen characters (where unseen is True):
  • If a specified character_id is unseen, then the corresponding action_type must be MOVE_TO or MOVE_TO_EVAC.
  • If a specified character_id is NOT unseen, then the corresponding action_type cannot be MOVE_TO.
  • These are mostly warnings if we aren't sure, because the character may silently swap from seen to unseen. We aren't going to be tracking that behavior in the validator
• For evac_id value matching, make sure the evac_id exists for that scene (following branching rules)
• cleanup for old is_valid checks throughout the original validation code