platform-atmelavr
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Add support for ATmegaxx5/xx50 and ATmegaxx9/xx90 chip families
The latest version of MegaCore, v2.2.0 adds support for the ATmega165, ATmega169, ATmega325, ATmega329, ATmega645, ATmega649, ATmega3250, ATmega3290, ATmega6450 and ATmega6490.
This PR adds manifest files for all these. The chips also have full bootloader support through MegaCore through the existing bootloader.py script.