Update 5.6.0

• [RF69 & CC1101] Reworked cached parameters into getters (by @phretor)
• [CC1101] Validate freq-dev unless special value 0 (by @phretor)
• [Pager] Added option to invert frequencies (#7)
• [Pager] Fixed default example pins
• [RF69] Missing 1000.0 multipler in (by @phretor)
• [Si443x] Added GFSK with BT 0.5 (#625)
• Access getIrqStatus() without Godmode and change the flag setting like SX126x handles it (by @caveman99)
• [Pager] Implemented inversion for receive (#641)
• Added support for unofficial Raspberry Pi Pico core (#643)
• Fixed inversion logic and inverted frame sync word (#641)
• [SX126x] Set DIO2 to RF switch by default for FSK too (by @matthijskooijman)
• Fix FSK Stream mode TX and RX (by Mitrokhin Anton)
• [PHY] Added debug direct mode output
• [Pager] Fixed inversion logic (#641)
• [SX127x] Removed unnecessary volatile
• [RF69] Fixed stream mode (#651)
• [Stream] Cleaned up transmit example
• [SX1280] Only check ranging address on slave
• [SX128x] Added option to set custom ranging calibration (#293)
• [SX126x] Fixed incorrect OCP step in documentation (#654)
• [SX126x] Added note about allowed OCP range (#654)
• Removed unnecessary interrupt enable (#657)
• [PHY] Made virtual overloads non-pure
• [EXT] Added support for external radios (646)
• [STM32WLx] Add module for STM32WL MCUs with integrated radio (#588) (by @matthijskooijman)
• [PHY] Added standby types abstraction
• [Hell] Fixed timing issues on SX126x with TCXO (#659)
• [CC1101] Fixed setPromiscuousMode(true) always failing