Optimize get_dangerous_tile, also is_ and prompt_

[sparr]

Summary

Performance "Reduce unnecessary/duplicate checks for dangerous tiles"

Purpose of change

Dangerous tile checking currently runs the same checks multiple times, and enumerates more dangers than necessary in some cases.

Describe the solution

Add a parameter to get_dangerous_tile for the max number of dangers to return, and use that parameter in is_dangerous_tile which doesn't care if there's more than one.

Add a parameter to prompt_dangerous_tile to provide the list of dangers if it's already available.

Describe alternatives you've considered

I thought about trying to use an optional wrapped reference instead of a pointer for harmful_stuff but my efforts were significantly less readable.

Testing

I created some fields and traps and moved around them to produce various prompts.

Additional context