more features to make robust flight

What's Changed

• Add in multiple device registrations to reduce fcount increments by @MedadRufus in #244
• put in korean TTN credentials on AU1 server by @MedadRufus in #247
• Loop through more helium devices by @MedadRufus in #248
• Send keys in uplink by @MedadRufus in #250
• Make watchdog catch timer failures by @MedadRufus in #255
• Disable uart output to reduce peak currents by @MedadRufus in #257
• dont reset watchdog in main loop by @MedadRufus in #260
• Tx with new gps fix each time by @MedadRufus in #262
• tx on ttn less frequently by @MedadRufus in #258
• Use eeprom update by @MedadRufus in #267
• only require 4 sats for position solution by @MedadRufus in #270

Full Changelog: v4.4.7-icspace0.2...v4.4.7-icspace0.3