2.0 checklist

[caver456]

Do this development in the radiolog repo as much as possible, so that it gets inherently tested in-situ with radiolog:

• _requestWorker code review and refactor #48
• new features added directly into a folder aren't visible until after toggling folder visibility #5
• remove addAppTrack #43
• preserve properties on edit using e.g. addMarker with existingId #42
• exceptions during processing of LiveTrack sync updates #41
• bad gateway #38
• add LiveTrack functionality (add / update)  #37
• retry / disconnect / reconnect handling #27
• allow close of map while leaving session open #24
• implement New Map functionality #45
• is dataQueue still needed? #46
• flag a disconnect immediately on failure of queued request #47
• copy latest functionality (callbacks etc) from addMarker for all other downstream-facing methods
• implement threading locks as needed
• clean up log messages
• finish co-development and testing in radiolog repo <-- merged 27 retry disconnect reconnect handling #49
• test whatever wasn't exercised by radiolog
• documentation
  • code comments
  • docstrings
  • readthedocs