Use point in game, line, map APIs

[jbytheway]

Summary

SUMMARY: Infrastructure "Convert some game, line, and map APIs to use points"

Purpose of change

My ongoing campaign to increase use of point for better type safety and code clarity.

Describe the solution

This time I've done:

• The remaining functions in map.h
• Functions in game.h
• Functions in line.h

I made some enhancements to my tool for finding these APIs (not yet published) which discovered the map.h functions I missed last time around.

Also, added a tripoint overload for abs (I already added a point overload in a prior PR).

Additional context

In support of #32017.