Wider `Vec2` support

[TheRedDeveloper]

Summary

Methods that take separate x: f32, y: f32 parameters should accept impl Into<Vector2> instead and there should be From implementations for (f32, f32), and macroquad's Vec2.

Motivation

Builder methods like .offset(x, y) and .pivot(x, y) take two separate floats. This means you can't pass a Vec2 directly, you have to destructure it: .offset(pos.x, pos.y).

With impl Into<Vector2>, you pass whatever you have.

Proposed API

el.floating(|f| f.offset((10.0, 20.0)));
el.rotation(|r| r.pivot((0.5, 0.5)));

let pos = Vec2::new(10.0, 20.0);
el.floating(|f| f.offset(pos));

Behavior

• .offset(10.0, 20.0) won't compile anymore. (Breaking change)
• The prelude remains unchanged