unify(ww3d2): Merge WW3D and move it to Core

[bobtista]

• Relates to Merge Generals and Zero Hour code into one #555
• Helps clean up chore(ww3d2): add IRenderBackend Interface #2613

Generals and Zero Hour differ only by comments and the disabled WWShade SHD_FLUSH hook.

Now Generals uses the Zero Hour implementation, and ww3d.cpp and ww3d.h are moved to Core using unify_move_files.py

Todo:

• Confirm both implementations are identical before moving
• Configure both game targets
• Replicate to Generals

[greptile-apps]

Greptile Summary

Centralizes the shared WW3D implementation in Core.

• Moves ww3d.cpp and ww3d.h from the Zero Hour tree into Core.
• Configures both game-specific WW3D targets to compile the Core implementation exactly once.
• Updates WW3D consumers in both game trees to use the shared include path.
• Records the completed move in the manual unification script.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
Core/Libraries/Source/WWVegas/WW3D2/CMakeLists.txt	Enables the centralized WW3D implementation through the Core interface source list.
Core/Libraries/Source/WWVegas/WW3D2/ww3d.cpp	Moves the Zero Hour WW3D implementation into Core and qualifies shared WW3D include paths.
Core/Libraries/Source/WWVegas/WW3D2/ww3d.h	Relocates the shared WW3D public interface without changing its contents.
Generals/Code/Libraries/Source/WWVegas/WW3D2/CMakeLists.txt	Disables the local implementation so the Generals target compiles the Core source once.
GeneralsMD/Code/Libraries/Source/WWVegas/WW3D2/CMakeLists.txt	Disables the local implementation so the Zero Hour target compiles the Core source once.
scripts/cpp/unify_move_files.py	Adds commented historical entries documenting the completed WW3D unification operation.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    Core["Core WW3D2<br/>ww3d.cpp / ww3d.h"]
    Generals["Generals g_ww3d2"]
    ZeroHour["Zero Hour z_ww3d2"]
    GConsumers["Generals WW3D consumers"]
    ZConsumers["Zero Hour WW3D consumers"]
    Core --> Generals
    Core --> ZeroHour
    Generals --> GConsumers
    ZeroHour --> ZConsumers

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