Release 1.9.5 - Platform.IO, PulseIn fix, Adafruit board tweaks

• Build libpico.a with PICO_XOSC_STARTUP_DELAY_MULTIPLIER=64 (#315)
• Adds board variant definition for Melopero Shake RP2040 (#318)
• Add PlatformIO support (#250)
• Reset the SDA and SCL pins to INPUT at Wire.end() to prevent multiple pins connected to I2C when changing pins (#302)
• Fix pulseIn detection (#293)
• Fix wire defines on feather (#281)
• Added minimal HW support for onboard WiFi modem. (#287)
• Add support for reverse numbering of analog pins. (#283)

Release 1.9.4 - Bugfix for IRQ-related issues

• Don't use no-c++-exceptions version of libstdc++ (#280)
• Add support for our new Challenger RP2040 board with LTE modem. (#275)

Release 1.9.3 - PWM, Wire, Windows Python fixes, and new board

• Adds support for Challenger RP2040 WiFi boards (#268)
• Minor paranoid nullptr checks in USB interface (#267)
• Use Stream::setTimeout to specify I2C TO (#263)
• Make multiple SDFS/LittleFS.begin calls noops (#262)
• Fix JSON URL (#261)
• Set available() to 0 when Wire.requestFrom fails (#259)
• Added missing SPI::setCS(pin) in docs (#256)
• Fix upload file path escaping on Windows (#254)
• Avoid issues w/other installed Windows Pythons (#253)
• Remove exception handling code, save RAM and FLASH (#245)
• Fix PWM frequency at low and high frequencies (#244)

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)