fix modern XKore2 login and map snapshots

[rmarquesbarcelona]

Summary

• carry forward the modern-client XKore2 work from fix: update xkore 2 to support new clients #3781 while preserving its original commit authorship
• decode the 32-byte Rijndael password used by 0ACF and pin the modern packet mappings needed by a 2020 client
• replay captured character-selection and inventory snapshots so the attached client receives complete modern records
• fix XKore2 map bootstrap and snapshot assembly issues that dropped equipment, skills, appearance data, and actors already on screen

Why

XKore2 still reconstructed several client snapshots with legacy packet layouts. A modern client could reach the proxy, but authentication or map initialization would fail, and successful attachments could show incomplete inventory/equipment or omit actors that existed before the client attached.

This refreshes the useful parts of #3781 and adds the missing packet capture/replay and parser corrections found during an end-to-end investigation.

Validation

• verified an end-to-end XKore2 attach against a rAthena server using a 2020 client: account, character, and map login completed
• confirmed the attached client received the complete 18-item inventory, equipped Knife and Cotton Shirt, and a Poring that was already on screen
• confirmed the modern 0436 map login / 007D load flow and 09FF actor snapshots
• added and passed a regression test for the 32-byte 0ACF Rijndael password parser
• passed the complete Windows unit suite: 1,185 tests with zero failures, using Perl 5.12.3 x86 matching the bundled XSTools DLL
• start.exe --help loaded the modified source tree and exited with code 0; only the existing Win32 console-size warnings were emitted

The PR remains a draft for maintainer review of the protocol compatibility scope.

Privacy

No private-server configuration, account credentials, character names, or captured user data are included.

Related: #3781