Release 5.0.0

Incompatibility warning
This release introduces backwards-incompatible changes to the public API!

[SX127x] Added interrupt-driven CAD (#396)
[SX126x] Added interrupt-driven CAD
[AX.25] Fixed command/response bit
Dropped support for ESP8266, HC05, JDY08, HTTP and MQTT
Added HAL
[PHY] Fixed known binary receive length
Set default FSK bitrate to 4k8