Add socket streaming capability

[semuadmin]

pyrtcm Pull Request Template

Description

Add socket streaming capability. Utilises a SocketStream utility class to allow sockets to be read using standard stream-like read(bytes) and readline() methods.

NB: previous parse_buffer() method in RTCMReader has been removed as this is now redundant.

Fixes # (issue)

Testing

Please test all changes, however trivial, against the supplied unittest suite tests/test_*.py e.g. by executing the tests/testsuite.py module or using your IDE's native Python unittest integration facilities. Please describe any test cases you have amended or added to this suite to maintain >= 99% code coverage.

Checklist:

• [x] My code follows the style guidelines of this project (see CONTRIBUTING.MD).
• [x] I have performed a self-review of my own code.
• [x] (if appropriate) I have cited my RTCM documentation source(s).
• [x] I have commented my code, particularly in hard-to-understand areas.
• [x] I have made corresponding changes to the documentation.
• [ ] (if appropriate) I have added test cases to the tests/test_*.py unittest suite to maintain >= 99% code coverage.
• [x] I have tested my code against the full tests/test_*.py unittest suite.
• [x] My changes generate no new warnings.
• [x] Any dependent changes have been merged and published in downstream modules.
• [x] I understand and acknowledge that the code will be published under a BSD 3-Clause license.