Continue to implement SqueakSSL [ci skip]
Continue to implement SqueakSSL [ci skip]

- Do not raise PrimitiveFailedErrors when SqueakSSL returns SSL error codes
- Add BIO_CLOSE, BIO_CTRL_PENDING, and BIO_set_close()
- Add support for loglevel

HPI-SWA-Lab/RSqueak,HPI-SWA-Lab/RSqueak,HPI-SWA-Lab/RSqueak,HPI-SWA-Lab/RSqueak