feat(scriptcompiler): add standalone SCB JSON converter

[bobtista]

• Closes Implement SCB to plain text to SCB compiler #288

Summary

• add ScriptCompiler tool to Core/Tools with bidirectional SCB JSON support
• use nlohmann-json via vcpkg and CMake
• support full roundtrip for scripts, groups, conditions, actions, params, preserving unknown chunks

Changes

DataChunk Library

• Extract chunk I/O functionality into platform-neutral Core/Libraries/Source/DataChunk/
• Provides clean API for reading/writing chunk-based binary files
• Decouples tool from Windows-specific engine code
• Enables cross-platform builds

Notes

• VC6 skips building this for now, as nlohmann/json requires some C++11 features

Testing (done)

• cmake --build build/unix --target core_scriptcompiler
• ./Core/Debug/scriptcompiler -in ~/Downloads/Scripts/SkirmishScripts.scb -out SkirmishScripts.json
• ./Core/Debug/scriptcompiler -in SkirmishScripts.json -out SkirmishScripts_roundtrip.scb
• Verified script/action/condition counts match between original and roundtrip outputs

[xezon]

The first observation is that the tool is decoupled from engine. Changing format in Engine will break the tool, unless changes are replicated to tool.

[bobtista]

The first observation is that the tool is decoupled from engine. Changing format in Engine will break the tool, unless changes are replicated to tool.

That's true. The point of that is so it's cross platform now. Some ideas:

• Extract the chunk structs + read/write helpers from the engine into a new library that’s platform-neutral
• Just have a process for updating the standalone tool whenever needed - how often will we need to do this really?
• Dual build: Add a Windows-only target and a macOS/Linux one, where only Mac users need to manually sync changes
• Scrap cross platform for now

[bobtista]

Ok I watched your stream, we can close this for now - but some day I hope to re-open it when we go cross platform :)

[xezon]

I think I was not too happy talking about this :D