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Implemented a new method for allowing folks to preserve their TinyUF2 bootloader setup when flashing their boards via Arduino IDE, without being locked out of not using it if they want to use a different partition.

Adafruit had already added support for keeping (reflashing) the TinyUF2 bootloader when flashing via Arduino IDE (thanks @ladyada ), but the issue with it is it doesn't allow users to not choose to use it. Even if they select a specific partition scheme from the partition drop down list, it ignores that selection and only does the TinyUF2 partitioning/bootloader thing.

We wanted to let users choose between keeping their TinyUF2 partitioning and bootloader, or choose another partition scheme and have the TinyUF2 support disabled and just operate like they would expect.

We've implemented this by adding the TinyUF2 support as a partition scheme option, and using these build options in platform.txt to choose to use teh UF2 path or use the standard path.