Use default generic float set to `Scalar`

[bvssvni]

Instead of setting the float type to Scalar explicitly, we might be able to use a default generic and lets you use the library with f32.

• math::Matrix2d => math::Matrix2d<T=Scalar>
• math::Vec2d => math::Vec2d<T=Scalar>
• math::Vec3d => math::Vec3d<T=Scalar>
• math::perp => math::perp<T=Scalar> where T: Float
• math::abs_transform => math::abs_transform<T=Scalar> whereT: Float`
• math::translate => math::translate<T=Scalar> where T: Float
• math::rotate_radians => math::rotate_radians<T=Scalar> where T: Float
• math::orient => math::orient<T=Scalar> where T: Float
• math::scale => math::scale<T=Scalar> where T: Float
• math::shear => math::shear<T=Scalar> where T: Float
• math::identity => math::identity<T=Scalar> where T: Float
• math::get_scale => math::get_scale<T=Scalar> where T: Float
• math::separation => math::separation<T=Scalar> where T: Float
• math::least_separation_4 => math::least_separation_4<T=Scalar> where T: Float
• math::margin_rectangle => math::margin_rectangle<T=Scalar> where T: Float
• math::relative_rectangle => math::relative_rectangle<T=Scalar> where T: Float
• math::overlap_rectangle => math::overlap_rectangle<T=Scalar> where T: Float
• math::area_centroid => math::area_centroid<T=Scalar> where T: Float
• math::area => math::area<T=Scalar> where T: Float
• math::centroid => math::centroid<T=Scalar> where T: Float
• math::line_side => math::line_side<T=Scalar> where T: Float
• math::inside_triangle => math::inside_triangle<T=Scalar> where T: Float
• math::triangle_face => math::triangle_face<T=Scalar> where T: Float
• math::to_barycentric => math::to_barycentric<T=Scalar> where T: Float
• math::from_barycentric => math::from_barycentric<T=Scalar> where T: Float
• types::Ray => types::Ray<T=Scalar>
• types::Rectangle => types::Rectangle<T=Scalar>
• types::Line => types::Line<T=Scalar>
• types::Polygon<'a> => types::Polygon<'a, T=Scalar>
• types::Polygons<'a> => types::Polygons<'a, T=Scalar>
• types::Radius => types::Radius<T=Scalar>
• types::Triangle => types::Triangle<T=Scalar>
• types::Width => types::Width<T=Scalar>