GPS soft serial support and GPS fixes

Added possibility to use both Serial RX (Spektrum satellite/SBUS/SUMD) and GPS at the same time.

- When features: feature SERIALRX, feature SOFTSERIAL and feature GPS are enabled Serial RX is using UART and pins 3&4 and GPS is using soft serial and pins 5&6.
- Fixed GPS code, so that now it's reconnecting if connection to GPS is lost.
- GPS tab on Chrome Configurator now shows GPS signal strength.
- Added autobauding option. (If connection is lost then it uses lower baudrate.)