Simple FOC, but with Rust.

Still a heavy WIP. Getting close to a very basic const-voltage implementation for esp32.

One motivation is the prospect of, sometime down the line, there being a Rust option in which to explore the Simple FOC playground. To that end, some design principals that I try to think about:

• No suprises when moving between Arduino and Rust: Moving between the two should bring a sense of familiarity. It should feel like applying the same concepts, in familiar patterns, just using idioms that change with the language being used.
• Simplicity, Accesibility, and Educational Enjoyment: Simple FOC delliberately makes design and implementation decisions that prioritises ease of use and enjoyment, and I aim to follow their lead. This will often imply that in order to make using this library simple, the underlying code must bear the burden of managing complexity.
• Advanced usage: Though not a primary aim, a bonus acheivement would include suitability for more advanced and nuanced use, such as 3d printer firmware. For emphasis: this goal is secondary to the first two.

With respect to licence and assigning credit for work:

This project started as a direct rewrite of the Simple FOC library. This has changed a touch, as Rust idioms and C++ Arduino idoms are at times in conflict. With that said, the project has gotten to its current state with a lot of direct input from the SFOC people, and this project continues to draw heavily from the original works of the SFOC Arduino library.

At time of writing, this is a re-write of Simple FOC library. "We stand on the shoulders of giants" couldn't apply more here. Please refer to the Citations file, and the OG library here