Release 1.9.2 - Pico-Debug support (1-chip full GDB), better errors

• Add pico-debug support (#239)
• Update toolchain, add CMSIS-DAP to OpenOCD (#241)
• Disable ignored-qualifier warning in SDK (#238)
• Add warning flags to build, catch missing return (#237)

Release 1.9.1 - TinyUSB 1.3.0

• Rename assembly dir to boot2, only has boot2.Ss (#230)
• Update tinyusb 1.3.0 (#228)
• Clean up include paths, remove duplicates/invalids (#229)

Release 1.9.0 - Updated toolchain, TinyUSB fixes, 64-bit formatting

• Add CPU cycle counter accessors (#226)
• Upgrade Newlib to include 64-bit/8-bit %llu/%hhd (#227)
• Use correct tusb_config.h for built-in usb (pico-sdk) (#219)

Release 1.8.8 - I2C Slave Fix

• Clear I2C status on short slave reads
• Remove accidental debug message

Release 1.8.7 - I2C Slave Fix

• Clear I2C status on short slave reads

Release 1.8.6 - Fix SD file creation

• Fix file creation on SD and SDFS (#216)

Release 1.8.5 - PDM library and Serial1/2.flush fix

• Fix SerialUART flush (#215)
• Add PDM library for Arduino Nano RP2040 Connect (#213)

Release 1.8.4 - Arduino Nano RP204 Connect preliminary support

• Initial Arduino Nano RP2040 Connect support (#212)

Release 1.8.3 - Serial read timeout fix

• Obey timeout value on SerialUART.read/.peek (#211)

Release 1.8.2 - Upgrade Pico-SDK, bugfix Tone() and Servo()

• Update to PICO-SDK version 1.2.0 (#207)
• Clear PIO FIFOs when updating Tone and Servos (#206)
• Clean up Arduino.h header, remove duplicates (#205)