Fractional hex on HexLayout

[ManevilleF]

Closes #138 Supercedes #140

Re implementation of #140 by @msparkles

I added CHANGELOG entries and some code clarifications.

Work done

Added the capacity to use fractional axial coordinates as Vec2 in HexLayout methods:

• Added HexLayout::fract_hex_to_world_pos method
• Added HexLayout::world_pos_to_fract_hex method

To avoid duplication and multi-method chaining I encapsulated the matrix computations in:

• Added HexOrientationData::forward method
• Added HexOrientationData::inverse method

I also added these utility methods:

• Added Hex::to_array_f32 utility method
• Added Hex::to_cubic_array_f32 utility method

[msparkles]

@ManevilleF Semirelated, why not just use Vec2? You can actually deconstruct them like this: fn foo(Vec2 { x, y }: Vec2)

...It's weird, no idea why Rust made it this way, but

[ManevilleF]

@ManevilleF Semirelated, why not just use Vec2? You can actually deconstruct them like this: fn foo(Vec2 { x, y }: Vec2)

...It's weird, no idea why Rust made it this way, but

Where ? The HexLayout methods do use a Vec2

[msparkles]

This

fn matrix_op(matrix: [f32; 4], [x, y]: [f32; 2]) -> [f32; 2] {

(on phone, dunno how to make links to lines on phone, soz)

[ManevilleF]

Yeah that is voluntary, I try to keep internal code as dependency free as possible, in the future I wish to have glam as an optional dependency