Reimplement adjacent tile region and height check

[Krarilotus]

TL;DR: Reimplements the game's check for a neighboring tile in a requested path region, as used during moat selection. The C++ makes the height rule explicit while preserving the original behavior.

Implements TileMapState::findTileInSameAreaAndNoTooHeightDifference at 0x00500370. It examines eight offsets from the caller's row, accepts a neighbor no more than 16 height units above the source tile, and compares its signed 16-bit region ID with the requested area. This is an existence check: route selection, terrain suitability, and caller input validation remain outside this helper.

Validation: built the linked OpenSHC.dll with MSVC 2005 SP1 in RelWithDebInfo and compared it against Crusader 1.41 with reccmp. Result: 100% effective match. The sole difference is the ordering of two independent setup instructions (add edx, ecx and lea ebx, [eax + 0x10]); the loop, comparisons, and returns match. This is not claimed as a byte-for-byte match or a gameplay fix.

No generated headers, runtime infrastructure, or emulator tooling are changed.

[TheRedDaemon]

This is missing the matching status file update.

[TheRedDaemon]

Can you check if this loop would also work by index access and iterating over the directions?
Basically a normal for-loop and then using this->directionTranslationMatrix[row][direction]?
If not might neighborOffset[direction] possible, avoiding the pointer?