This patch refactors the transmission calculation logic by replacing the specific `TransmissionConverter` with a more generic `Transmission` trait.
- A new `transmission` module is created, containing the `Transmission` trait and a `FixedTransmission` implementation.
- The `Transmission` trait provides a generic interface for converting between input and output values for various `uom` types (e.g., `AngularVelocity`, `Angle`, `Velocity`).
- The hardcoded `TransmissionConverter` is removed.
- The `ScrewSpeedController` is updated to use the new `FixedTransmission`, making the ratio configuration more explicit and improving type safety.
Icedsoda
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