GPS fixes and GPS soft serial support

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.
- Possibility to disable SBAS (ground assistace type). (SBAS causes occasional severe altitude calcuation errors)
Could I add gps_autobaud option to CLI? So that: 0 is disabled and 1 enabled. So after enabling that gps_autobaud option gps baudrate will be decreased automatically if there are timeouts from GPS data.