EXPERIMENTAL: Rip out WALLHACK flag (for now)

[zach2good]

I affirm:

• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

With all of my experimentation around navmesh rebuilding, It became apparent that the quality of the navmeshes were only like 15% of the problem. The overwhelming majority of the problem is that mobs will do a FINE job walking part-way to you, and then wallhack the rest. This wallhacking makes them run over holes and ledges that are CORRECT in the navmesh.

So, I've ripped out all the wallhacking and we're going to reintroduce it from scratch, knowing that at it's base level mobs move correctly and safely.

Also collecting problem areas and areas rife for abuse, so if you're an abuser don't get your hopes up.