Windows support

[RalfG]

Add support for Windows.

To do:

• Make extra compile arguments compatible
• Add Windows to build platforms in cibuildwheel action
• Update readme

Extra:

• Made HCD model name synonymous to HCD2021 for backwards compatibility
• Fixed build for macOS: Missing XGBoost dependency in build environment: libomp
• Avoid extra test runs due to on: [push, pull_request] by specifying push branch

Caveats for compiled wheels:

• 32bit platforms not built, as XGBoost wheels are missing
• Python 3.9 and 3.10 not built, as pyTables wheels are missing: release wheels for python 3.9 PyTables/PyTables#823