Refactor Actions to support more use-cases #316

The current action system is not great when it comes to:

• Making it easy to highlight available actions or available action options (some progress has been made in Make actions a part of view #175)
• Choices with infinite possibilities (strings, numbers) but that should still be possible for AIs to choose something
• "When you do X, it costs Y less"
• "When you do X, it also does Y" or "When you do X, increase the effect by Y"
• "When X happens, do Y instead"
• Inform about why actions cannot be done
• Being able to dynamically add or remove choice options

To solve this:

• Store requirements and effects, connect them with a value, and allow other rules to change that value or override the requirement/effect
• Keep track of rule requirements, actions, options, etc. and return results for each of them (which rule fails, why they're not allowed, how much damage was done, etc.)

Later:

• Multiple choices that are not directly dependent on each other

• "You may" choices that are optional and you have to suit yourself if you forget it

• Allow actions to have multiple parallel choices at the same time