Update to latest GLFW

[errissa]

Type

• Bug fix (non-breaking change which fixes an issue): Fixes #
• New feature (non-breaking change which adds functionality). Resolves #
• Breaking change (fix or feature that would cause existing functionality to not work as expected) Resolves #

Motivation and Context

Updates Open3D to use the latest GLFW as the version we had been using is several years old and predates Mac API changes. Also, updated to build system to build GLFW as external project to make it consistent with the rest of Open3D's use of third party libraries.

Checklist:

• I have run python util/check_style.py --apply to apply Open3D code style
  to my code.
• This PR changes Open3D behavior or adds new functionality.
  • Both C++ (Doxygen) and Python (Sphinx / Google style) documentation is
    updated accordingly.
  • I have added or updated C++ and / or Python unit tests OR included test
    results (e.g. screenshots or numbers) here.
• I will follow up and update the code if CI fails.
• For fork PRs, I have selected Allow edits from maintainers.

Description

[update-docs]

Thanks for submitting this pull request! The maintainers of this repository would appreciate if you could update the CHANGELOG.md based on your changes.

[ssheorey]

Looks good. We can merge after testing. Thanks!

[ssheorey]

Possibly fixes #1673

[ssheorey]

Test draw example and O3DVisualizer. Also test legacy visualizer.

[ssheorey]

Hi @errissa can you check the error in the documentation CI? Also, do all examples run for you? I got a crash in one draw.py example on Intel macOS.

[ssheorey]

Works for me on intel Mac now.

[ssheorey]

Everything works, except double clicking on a file in macOS does not open the file with Open3D. Need to check how macOS is passing the file name to glfw.