adds config options for C++ TestMate -- this extension rules: it decorates individual test cases with run options, and creates an interactive testing menu (accessible from vscode toolbar)
adds task which automatically builds tests when they are run through C++ TestMate -- no need to call make test/run-test any more!
I have also set up a separate debug launch config for telemetry unit tests (enables running tests from vscodes 'Run and Debug' panel)
General
adds recommended extensions list (we should probably all be using this feature of vscode)
removes direct reference to Serial from SensorThermo (it's not guaranteed that Serial.begin is called in this project)
Tests
General