Harmonized includes

• Fixed some identifiers in includes for the new tinyAVR 0-series which had same name and meaning as those in megaAVR 0-series headers but different capitalization/spelling. Headers should be more harmonic and switching from one microcontroller to another should not require code changes.

Support for new ATtinys

• Added support for ATtiny402 & 412

Merged upstream changes

Merged upstream changes but don't expect major functionality changes.
This release also bumps the version# to prevent conflicts with packages available in official distro repos.
Will no longer provide pre-built windows binaries starting with this release, but it can still be built under windows in the regular way or by running the build.sh script.

Fixes for fuse default values

• Fixed default fuse values in device headers to match those in the datasheets.
• Built on:
  • MSYS2 for x86_64
  • Ubuntu 21.04 for x86_64 and aarch64

Support for ATmega4808

• Added support for AVR8x/AVRXmega3 family:
  • EEPROM
  • Sleep
  • Watchdog
• Added support for ATTiny program memory read.
• Added support for ATmega4808. Tested on AVR-IoT WG Development Board.
• Built on MSYS2 MinGW for Windows.

Support for ATmega324PB

• Taken from SVN sources
• Removed a test file (aux.c) which used a Windows reserved name.
• Added support for ATmega324PB.
• Built on MSYS2 MinGW for Windows.