Add motor mixing

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One typical control block from multirotor control architecture includes the part where controller calculates desired throttle, roll, pitch and yaw values. How is that processed further? What is responsible to distribute the angular velocities across n motors that multirotor possesses? That crucial part is called the Mixer. The specific field of science that does research on that matter is called Motor Mixer Theory, more about that can be red on this link: (https://cookierobotics.com/066/)

In order to complete #13 issue, Mixer feature is a must!

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Please try writing about what something is and why we need it in the future in such issues. It will not only help by being self-documenting and opening up discussion points for us, but also introduce any other contributors or users to the topic.

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Please try writing about what something is and why we need it in the future in such issues. It will not only help by being self-documenting and opening up discussion points for us, but also introduce any other contributors or users to the topic.

Thank you for clarifying this! I have edited the issue, you can check it out! I will create the sub issues to point to the specific technical things that needs to be done for this matter.