feat: add Dart Lizard creature

[skleinjung]

• Update item handling to require world registration, track the container, and automatically remove from old container when stowing.
• Extract script API and refactor engine to provide an implementation.
• Add dart lizard and tail scripts.
• Add scriptData to creature. Share script instances between all creatures referencing it.
• Add script API function for selecting random tiles on the map.
• Add script API functions for adding creatures and selecting random tiles on the map.
• Replace 'onUpdate' script method with 'onTurn'.
• Add script to cause dart lizards to spawn near heavy brush.
• Rework event system to allow easier adding of new event types.
• Update Dart Lizards to periodically dash into the woods.
• Lizards will wait a minimum # of turns after appearing before darting away.
• Add sensor to detect creatures 'in front' of the sensing creature.
• Add startle behavior to dart lizards.
• Cause startle when being attacked.
• Add ability to wait and some tuning on dart lizards.