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)
Maybe you misunderstand this code - the baudrate search is for when retards don't specify a baudrate or choose a wrong one - it falls back for a reason.