Needs updated godot-cpp to build library with custom toolchains.
Make the OpenSSL and CMake tools more customizable letting the user
override the default platform flags via build options.
Improve dependency handling.
Since the OpenSSL build system does not support macOS universal
binaries, we first need to build the two libraries separately, then we
join them together using lipo.
Update build targets.
Move release script out of CI yaml.
Disable debug CI builds for Godot 3.x since they are mostly used for
debugging the extension itself.
