1.6.0

• New board manifests for the following boards and generic MCUs: Curiosity Nano AVR128DA48, Curiosity Nano AVR128DB48, ATtiny1624, ATtiny1626, ATtiny1627, ATtiny3224, ATtiny3226, ATtiny3227, ATtiny424, ATtiny426, ATtiny427, ATtiny824, ATtiny826, ATtiny827
• Added support for Arduino DxCore (#19)
• Updated MegaTinyCore to v2.5.11 (release notes)
• Updated MegaCoreX to v1.0.10 (release notes)
• Better handling of the bootloader path in AVRDUDE upload flags (#33)
• Minor fixes and improvements (#20, #31, #37, #39)