feat: auto ladder climbing and ledge prompts

[scarf005]

Summary

SUMMARY: Features "Made ladders work like ramps and ledges auto-examinable"

Purpose of change

There's two way of going down a ledge:

1. jump down (may hurt)
2. climb down

option 2 can only be accessed via (e)xamine, and 90% of time climbing down is a better choice.

moving z-levels up and down with stepladders were also tiresome.

Describe the solution

1. made game::prompt_dangerous_tile to call iexamine::ledge instead if and only if dangerous terrain is ledge.
2. made furniture with LADDER flag act as ramps. when climbing up, the check is done just before handling invalid moves to not interfere with walking, opening door, etc.

Describe alternatives you've considered

• make it an option?
• make auto ledge examine more granular depending on Dangerous terrain warning prompt?

Testing

2023-09-15_14-19-02.mp4

2023-09-15_15-22-38.mp4

auto ladder and grappling hooks climbing (anything with LADDER flag will work)

2023-09-15_15-10-41.mp4

auto ledge prompts