Added more SPort GPS Sensors

Fix code style

Adding DIY IDs

Moved navstate and gpsfix away from Temp1 and Temp2 to their own IDs

More consistent names

Fix codestyle

Rebase work off master frsky_telemetry driver

Fixed code-style error

forgot something

The device ID is defined as a uint32_t in the driver and topic but
stored as a int32_t param. It is therefore sufficient if the device ID
is not 0 in order to be valid.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Add required rotation option to driver startup command and fix a couple of details in warnings/comments

change type mag_scale to type struct mag_calibration_s for compatibility with master (only noted this thanks to travis build test)