0.12.1 - Data loader bug fixes

Rerun is an easy-to-use visualization toolbox for multimodal and temporal data.

• C++: https://github.com/rerun-io/rerun/releases/download/0.12.1/rerun_cpp_sdk.zip
• Python: pip install rerun-sdk
• Rust: cargo add rerun and cargo install rerun-cli
• Online demo: https://app.rerun.io/version/0.12.1/

---

🌊 C++ API

• Fix CMake trying to pick up test folders outside of the Rerun project/zip #4770 (thanks @KevinGliewe!)
• Document that Mat3x3 and Mat4x4 constructors are column major #4842

🦀 Rust API

• Fix entity_path_vec! and entity_path! depending on ToString being in scope #4766 (thanks @kpreid!)

🪳 Bug Fixes

• Fix external data loader plugins on Windows #4840
• Reduce latency when loading data from external loaders #4797
• Always point to versioned manifest when building a versioned binary #4781

🧑‍💻 Dev-experience

• External loaders: remove warnings on duplicated binary on $PATH #4833

🤷‍♂️ Other

• Include Cargo.lock in rerun-cli crate #4750
• Replace atty dependency with std::io::IsTerminal #4790 (thanks @kpreid!)