Scale param

[raphaelDkhn]

Introducing Fixed point params thanks to Rust's const generics.

You can now define a fixed point by its scale as follow:

let a = Fixed::<15>::from_f64(3.14);

Pull Request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build-related changes
• Documentation content changes
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Does this introduce a breaking change?

• Yes
• No

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