Guard Illness

[armele]

Closes #11597

I could not reliably reproduce the symptom (guards not going to the hospital when sick) in a consistent, repeatable pattern, so I am not 100% sure that these fixes completely resolve it - but they address the theories I have as to the root cause.

Changes proposed in this pull request

• Adjusted EntityAISickTask to not stop the trip to the hospital until the entity is asleep in a hospital bed (not just asleep somewhere randomly, as guards are prone to do).
• Adjusted CitizenAI to prioritize addressing illness as a higher priority than addressing hunger.
• Adjusted AbstractEntityAIGuard to allow sickness to make them interruptable in their guard duties, and to wake them up (in case they become ill while sleeping).

Testing

I poisoned my entire barracks full of guards with rotten flesh and followed them first to their hut block (as is already the pattern), then to the hospital, where they found a bed until cured, then left and resumed their guard duties.

Review please

[github-actions]

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[armele]

Please remove the "Untested" label. Tested as described above.