Scrying stance should take heed of remaining enemies

[maurezen]

Use scryer stance: should back off when remaining enemies in zone holding counter receives 0.
Use when overkill: if set, should be a primary backoff for scryer stance. When not overkill, backs off to auto stance.
Maybe use in maps: should calculate mean hits per map and calculate profits of D vs S accordingly.

[maurezen]

Remaining enemies counter taken care of.

Can technically infer the exact tiles, but that looks like cheating to me.

[maurezen]

Looks like after this backoff was restricted to world only it works as intended.
Use when overkill backs off to auto anyway.
Maybe calculations are left to #12.

[maurezen]

Had to fix a bug in scryer where map (not) force scry was applied to void maps as well