fix(gameengine): Remove music tracks as prerequisite to initialize the game engine

[xezon]

• Closes fix(headless): Skip early load abort in headless replay simulations #2730

This change removes music tracks as prerequisite to initialize the game engine. The game can now be started without the physical presence of music files. The game works normally, but without music.

[greptile-apps]

Greptile Summary

This PR removes the isMusicAlreadyLoaded() check as a hard prerequisite for game engine and WorldBuilder initialization, allowing the game to start even when music files are absent (running silently without music instead of quitting).

• Removes the isMusicAlreadyLoaded() virtual method declaration from AudioManager and deletes its implementation in GameAudio.cpp, eliminating the filesystem check for music track presence.
• Removes all four call sites across both GameEngine.cpp variants and both WorldBuilder.cpp variants, fully completing the cleanup with no orphaned references remaining.

Confidence Score: 5/5

Safe to merge — the change is a clean, complete removal of a file-presence check that was blocking initialization when music files were absent.

All declaration, implementation, and call sites for isMusicAlreadyLoaded() are consistently removed across both game variants and both tool variants. A repository-wide search confirms zero remaining references, so there is no risk of compilation failures or dangling call sites.

No files require special attention.

Important Files Changed

Filename	Overview
Core/GameEngine/Include/Common/GameAudio.h	Removes virtual isMusicAlreadyLoaded() declaration from AudioManager; no remaining references in the codebase.
Core/GameEngine/Source/Common/Audio/GameAudio.cpp	Removes the isMusicAlreadyLoaded() implementation that iterated audio events and checked for a music file on disk.
Generals/Code/GameEngine/Source/Common/GameEngine.cpp	Removes isMusicAlreadyLoaded() guard that called setQuitting(TRUE) when music files were absent.
GeneralsMD/Code/GameEngine/Source/Common/GameEngine.cpp	Same isMusicAlreadyLoaded() guard removal as the Generals variant; symmetric and consistent.
Generals/Code/Tools/WorldBuilder/src/WorldBuilder.cpp	Removes early return FALSE when music files were absent in WorldBuilder init; initialization now proceeds without music.
GeneralsMD/Code/Tools/WorldBuilder/src/WorldBuilder.cpp	Same WorldBuilder early-return removal as the Generals variant; symmetric and consistent.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[GameEngine::init / WorldBuilder::InitInstance] --> B[initSubsystem TheAudio]
    B --> C{Before PR:\nisMusicAlreadyLoaded?}
    C -- No --> D[setQuitting TRUE / return FALSE]
    C -- Yes --> E[Continue initialization]
    B --> F{After PR:\nNo check}
    F --> E
    E --> G[initSubsystem TheVideoPlayer, etc.]
    G --> H[Game / WorldBuilder ready]

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_{Reviews (2): Last reviewed commit: "Also fix World builder" | Re-trigger Greptile}

[xezon]

This change also fixes the Replay Check.

[Caball009]

Looks ok to me. Good to see the CI Replay checker working again.