Update 5.4.0

• Fixed compatibility with STM32 core >2.0.0 (#549)
• [Morse] Reworked example naming
• [Morse] Added Morse transmit AM example
• [Morse] Added basic Morse receive support (#545) CI_BUILD_ALL
• [MOD] Cache tone value on ESP32 (#553)
• [APRS] Added Mic-E (#430)
• [RFM9x] Fixed missing default argument for beginFSK (#553)
• Introduce setRSSIThreshold on RF69 modules (by @obones)
• Introduce setRSSIThreshold on SX127x modules (by @obones)
• [SX127x] Definition fixes suggested by @MrSniffer
• [SX127x] Added software timeout when using blocking receive without DIO1 (#566)
• [PHY] Added finishTransmit
• [Pager] Implemented POCSAG (#7)
• [SX126x] Added post-transaction error checking (#575)
• [SX126x] Fixed RTC control register address (#575)