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Passable ED-Embrasures [BAL]

Patches Jaxxa's ED-Embrasures to make them passable like Sandbags, but with a much greater degree of slowdown.

Very simple patch that adds "passability" of PassThroughOnly to the ED-Embrasure, with a very high "pathCost" of 9000, and a "pathCostIgnoreRepeat" of true (same as Sandbags; once the pawn is considered to be 'inside' the terrain, they are not slowed down further).

Passable but slowing embrasures lead to far more "reasonable" enemy melee behavior than fully impassable embrasures. Melee raiders and animals will directly assault a position of embrasures, slowly "scaling" the walls without being driven to utterly baffling maneuvers in their search for a conveniently unblocked (but extremely roundabout and more than likely trapped beyond belief) pathway.

The time that raiders spend crossing a single tile is very high; a typical pawn with 4.60 c/s movement speed takes almost exactly seven seconds to move "into" an embrasure in this way (after which they are no longer slowed). Seven seconds is enough time for a player to reasonably pull pawns back and escape through a door, possibly behind a second line of embrasures, before the enemy is able to finish crossing.

This patch is best used to build functional but not fully impassable lines of defense or firing positions.

Please note that this patch does not fix the Rimworld's AI tendency to get baited into long, 1 cell wide mazes. In fact, it exacerbates the issue by strengthening the typical 1-wide maze design (replace the alternating sandbags in a typical maze with patched embrasures). My sincere suggestion is to avoid this patch if you enjoy building such mazes.

These changes were inspired by, but not entirely the same as, the passable embrasures from Medieval Times.

Big thanks to Jaxxa for his original work on ED-Embrasures.