Cherry picked Linux fixes and improvements from pr #1096

[Delta-473]

As that pr is still a draft, I have cherry picked all the non Godot code from the branch as it has some nice improvements for native Linux support and cleanups. Unfortunately I don't know how to do a partial cherry pick and keep Frozenreflex as the author of the other commits.

Summary by CodeRabbit

• New Features

  • SCD extraction now produces per-stream decoded media (Ogg Vorbis, MSADPCM WAV) alongside raw data.
  • Added CVBL loader for KH1, enabling mesh and vertex parsing.
  • Added KH2 BGM reader with per-track payload support.
  • Added KH2 BOP reader for structured entry parsing.
  • Extraction tool gains output-mode to place original/remastered files adjacent or in separate folders.
  • Added placeholder KH2 Wd class.

• Documentation

  • KH2 model docs: “UVSC option” now links to the UV scroll section.

[coderabbitai[bot]]

Walkthrough

Reworks SCD to instance-based headers and per-stream StreamHeaders/StreamFiles/MediaFiles with codec-specific decoding for codecs 6 and 12. Adds EGS Extract outputMode to control output paths. Introduces KH1 Cvbl mesh/vertex/joint loader. Adds KH2 Bgm and Bop parsers and an empty Wd class. Minor docs header->link tweak.

Changes

Cohort / File(s)	Summary
SCD parser refactor + per-codec media OpenKh.Bbs/Scd.cs	Replaces static headers with instance FileHeader and tableOffsetHeader; adds StreamHeaders, StreamFiles, MediaFiles; adds AuxChunkCount to stream header; Read() now populates per-stream data and decodes codecs: 6 (XOR-decrypt Ogg), 12 (wrap MSADPCM in WAV); preserves raw stream bytes.
EGS extract output mode OpenKh.Egs/EgsTools.cs	Adds ExtractFileOutputMode enum and extends Extract(...) with outputMode parameter; adjusts original and remastered output paths for SeparateRoot vs Adjacent modes.
KH1 CVBL loader OpenKh.Kh1/Cvbl.cs	Adds Cvbl parser and data model: CvblHeader, MeshEntry, Submesh, vertex formats (styles 8/9/10) implementing IVertex; parses vertices, faces, joint mappings; optional MDLS-based transforms to compute global vertex positions.
KH2 audio and data models OpenKh.Kh2/Bgm.cs, OpenKh.Kh2/Bop.cs, OpenKh.Kh2/Wd.cs	Adds Bgm with header, per-track raw payloads, command enum and helper; adds Bop reader with BopEntry binary-mapped records and Entries list; adds empty Wd class.
Docs link tweak docs/kh2/file/model.md	Changes “UVSC option:” header to linked form “UVSC option:”.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  participant App
  participant Scd as Scd.Read
  participant Codec as CodecHandler
  App->>Scd: Read(stream)
  Scd->>Scd: Parse FileHeader, tableOffsetHeader
  loop For each stream
    Scd->>Scd: Read StreamHeader + raw bytes
    alt Codec 6 (Ogg)
      Scd->>Codec: XOR decrypt + extract vorbis headers
      Codec-->>Scd: Ogg bytes -> MediaFiles
    else Codec 12 (MSADPCM)
      Scd->>Codec: Wrap RIFF/WAV
      Codec-->>Scd: WAV bytes -> MediaFiles
    else Other
      Scd-->>Scd: MediaFiles add null
    end
  end
  Scd-->>App: Return Scd (FileHeader, StreamHeaders, StreamFiles, MediaFiles)

sequenceDiagram
  autonumber
  participant Tool as EgsTools.Extract
  participant FS as File System
  Note over Tool: outputMode: SeparateRoot | Adjacent
  Tool->>Tool: Compute originalPath (based on outputMode)
  Tool->>Tool: Compute remasteredPath (based on outputMode)
  Tool->>FS: Write original file
  Tool->>FS: Write remastered file (if present)

sequenceDiagram
  autonumber
  participant App
  participant BGM as Bgm.Read
  App->>BGM: Read(stream)
  BGM->>BGM: Read header
  loop TrackCount
    BGM->>BGM: Read length + payload
    BGM-->>BGM: Tracks.Add(raw)
  end
  BGM-->>App: Return Bgm (header + Tracks)

Estimated code review effort

🎯 5 (Critical) | ⏱️ ~120 minutes

Poem

I nibble bytes and hop through streams,
Ogg and WAV spill sunlight beams,
Meshes sprout joints, faces align,
Tracks and entries stack in line,
A tiny link nudges docs—hooray! 🥕✨

[!TIP]

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[kenjiuno]

About the build error Invalid expression term '[',

It comes from <TargetFramework>net6.0</TargetFramework> of OpenKh.Kh1/OpenKh.Kh1.csproj.

The collection expressions [JointSlotId] is available since net8.0.

The array reference type - C# reference | Microsoft Learn

Many of the examples in this article use collection expressions (which use square brackets) to initialize the arrays. Collection expressions were first introduced in C# 12, which shipped with .NET 8. If you can't upgrade to C# 12 yet, use { and } to initialize the arrays instead.

Fix it with a traditional expression new ushort[] { JointSlotId }, or just merge .net8.0 merge request first.