todo: replace 3rdparty folder with a better solution

[nullobsi]

Vendoring entire libraries is not very sustainable and we can miss out on feature updates.

Alternatives to consider:

• Rely on external package managers. Great on Linux/MSYS2, not so great on macOS.
• Use Git submodules. Inflexible if we need patches.
• Use CPM. Might be overkill, but could be gated on Linux to prefer using system packages.