CMake for linux

[2bndy5]

The usage of CMake for this library follows suite with the same implementation in the RF24 repo (except the RF24_DRIVER option). The DEBUG macro is renamed DEBUG_LEVEL, so it can be changed from CMake CLI option and not confuse users with the BUILE_TYPE option (whose value is usually DEBUG, RELEASE, etc.)

New build-linux workflow that

• cross-compiles & packages the library targeting armhf & arm64 architectures
  • packages targeting armhf & arm64 architectures will be automatically uploaded to future releases' assets
• tests the python wrapper installation (not cross-compiled though)
• tests the library examples (not the python examples though)

---

• Additional improvements to the CI workflow scripts that limit triggers to only when relevant files are modified.
• python wrapper now includes metadata recognized by pypi.org (specifically the license agreement)
• The Ncurses examples are now automatically built if libncurses5-dev installation is detected. If libncurses5-dev is not present, then the ncurses examples are not built.

[2bndy5]

🧹 🏆 You win!