Headless replay player

[MichalLabuda]

Summary

Adds a new headless replay-player tool that loads and plays back .rpl replay files without a GUI, reporting live progress and detecting desyncs.

New files

• extras/replay-player/CMakeLists.txt - build target linking against s25Main and Boost; includes DLL gathering on Windows.
• extras/replay-player/HeadlessReplay.h/.cpp - supporting types and helpers:
  • HeadlessGameState - minimal ILocalGameState implementation (player 0 / host); forwards Lua SystemChat messages to stdout.
  • ReplayStatus - tracks game reference, total GF count, wall-clock start time, and last-reported GF for progress display.
  • printConsole() - cross-platform console output: uses WriteConsoleA with VT100 mode enabled on Windows, boost::nowide::cout elsewhere.
  • printTable() - live-updating stats table using ANSI cursor-up escape codes, refreshed every second. Shows current GF / total GFs, game clock, wall clock, GF/sec, and per-player Country / Buildings / Military / Gold statistics. Defeated players are shown with strikethrough.
  • printInitialInfo() - prints replay metadata (map name, version, type, size, seed, GF range) and a player roster before playback begins.
• extras/replay-player/main.cpp - main program:
  • Accepts the replay path via --replay / -r or as a positional argument.
  • Supports both new-game replays (decompresses embedded map data and Lua script to temp files) and savegame-based replays.
  • Applies the fish-fix skip for replays predating version 8.3.
  • Executes all game commands frame by frame, verifying async checksums on each GameCommand.
  • Reports the first desync with GF number and actual-vs-stored checksum; --verbose / -V additionally dumps the full async log.
  • Exits with code 0 if no desyncs were found, 1 otherwise (also 1 on any load/parse error).
  • Replay path argument supports <RTTR_X> placeholders and leading ~ via RTTRCONFIG.ExpandPath().
  • Two-tier help: brief usage on no-args or parse error; full option list with path expansion reference on --help / -h.
  • --version / -v prints title, version, revision, compiler, and OS.