/// ## prelude
///
/// This module contains everything you need to utilize already created `MeasureSystem` and units.
///
/// This and the `unit_creation` module have overlapping contents, so you only need to import one
/// ## unit_creation
///
/// This module contains everything needed to make a new `MeasureSystem`, and units for it.
///
/// ~~It also re-exports `PhantomData` which is needed for new Units.~~
///
/// IMPORTANT: PhantomData is no longer required.
///
/// When making a new `MeasureSystem`, it is advised to use `dims_derive`,
/// so you can quickly apply the required traits.
///
/// This and the `prelude` module have overlapping contents, so you only need to import one