adding radio rssi variables and getting the values from mavlink
- updating mavlink headers with current pixhawk version
- fixing some function declarations
- adding readme
- adding radio rssi panel next to mavlink heartbeet
- added config for radio RSSI panel
- commented out the unused efficiency panel
- updated charset for RSSI
- modified mavlink heartbeat panel so it fits nicely next to RSSI
- show gps fix type in GPL panel
- reverted mavbeat panel back to old variant
- made gps fix symbols more transparent
- updated tool build
- synced gps fix panel with tool