Thor McAvenia

add floodfill, floodfill_mut, neighbors, and neighbor_indices

1

Added functions to yield iterators to neighboring pixel indices or references to the pixels, in-place floodfill, and floodfill.

Add floodfill

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I intend to add an implementation of the [floodfill](https://en.wikipedia.org/wiki/Flood_fill) algorithm

[help]: CMSIS SVD file wanted

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### Help Hello, I am looking to write Rust libraries providing a hardware abstraction layer and a peripheral access API for this system. If anyone could provide an [SVD](https://www.keil.com/pack/doc/CMSIS/SVD/html/index.html) file...