Moved OpenAL code into Core shared code folder.

[DMJC]

No description provided.

[Copilot]

Pull request overview

This PR refactors the OpenAL audio backend so it lives under Core/GameEngineDevice/ as shared cross-game device code, and updates both Generals and Zero Hour game-device builds to consume it through the Core CMake interface targets.

Changes:

• Move OpenALAudioDevice headers/sources into Core/GameEngineDevice and expose them via corei_gameenginedevice_private when SAGE_USE_OPENAL is enabled.
• Update GeneralsMD/Code/GameEngineDevice and Generals/Code/GameEngineDevice CMakeLists to stop listing OpenAL/FFmpeg sources directly and rely on Core-provided sources/includes.
• Update the dev diary entry for 2026-03-31 to reflect the refactor.

Reviewed changes

Copilot reviewed 4 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
signal-desktop-keyring.gpg	Adds a binary GPG keyring file at repo root (not part of OpenAL refactor).
GeneralsMD/Code/GameEngineDevice/CMakeLists.txt	Removes duplicate OpenAL source listing; relies on Core interface sources when SAGE_USE_OPENAL is enabled.
Generals/Code/GameEngineDevice/CMakeLists.txt	Removes GeneralsMD absolute-path OpenAL source usage; relies on Core interface sources/includes.
docs/DEV_BLOG/2026-03-DIARY.md	Rewrites the 2026-03-31 entry to describe the OpenAL move/refactor.
Core/GameEngineDevice/Source/OpenALAudioDevice/OpenALAudioStream.cpp	Adds streaming source/buffer management implementation under Core.
Core/GameEngineDevice/Source/OpenALAudioDevice/OpenALAudioManager.cpp	Adds the OpenAL audio manager implementation under Core (large file moved in).
Core/GameEngineDevice/Source/OpenALAudioDevice/OpenALAudioCache.h	Adds the OpenAL audio file cache header under Core.
Core/GameEngineDevice/Source/OpenALAudioDevice/OpenALAudioCache.cpp	Adds the OpenAL audio file cache implementation under Core.
Core/GameEngineDevice/Include/OpenALAudioDevice/OpenALAudioStream.h	Adds the OpenAL stream public header under Core.
Core/GameEngineDevice/Include/OpenALAudioDevice/OpenALAudioManager.h	Adds the OpenAL manager public header under Core.
Core/GameEngineDevice/CMakeLists.txt	Wires OpenALAudioDevice sources/includes into Core interface targets and conditionally provides FFmpegFile.cpp.