Rename 'UbloxGPS' to 'UBXGPS' and refine docs

.vscode/settings.json

CMakeLists.txt

cmake/boardcore.cmake

src/shared/sensors/UBXGPS/UBXFrame.h

src/shared/sensors/UBXGPS/UBXGPS.cpp

src/shared/sensors/UBXGPS/UBXGPS.h

src/shared/sensors/UBXGPS/UBXGPSData.h

src/tests/sensors/test-ubxgps.cpp