Missing Vector3 methods to be added

[ElectricCoffee]

The following methods in Vector3 have yet to be added:

• [x] distance(self, other: Self) -> f64 -- Returns the distance between two vectors.

• [x] slerp -- Spherical lerp

• [ ] ortho_normalize(normal: &mut Vector3, tangent: &mut Vector3, binormal: Vector3) -- Normalizes normal. Normalizes tangent and makes sure it is orthogonal to normal. Normalizes binormal and makes sure it is orthogonal to both normal and tangent.

• [x] project -- Projects a vector onto another vector

• [ ] project_on_plane -- Projects a vector onto a plane defined by a normal orthogonal to the plane.

• [ ] rotate_towards -- Rotates a vector towards a target

[ElectricCoffee]

distance is implemented and available in v. 2.0.0

[ElectricCoffee]

slerp now implemented in the develop branch

[ElectricCoffee]

project now added in the development branch.

Made it a part of the trait, since projection isn't unique to 3D vectors