Divide the large Bezier-rs implementation file into smaller ones (#751)

* Refactor bezier lib file into a separate folder

* Add better implementation comments

* Update import of Subpath from bezier-rs

* Add comment to describe compare.rs

* Remove printlns and adjust spacing

libraries/bezier-rs/src/bezier/mod.rs

@@ -0,0 +1,52 @@
+#[cfg(test)]
+pub(super) mod compare;
+
+mod core;
+mod lookup;
+mod manipulators;
+mod solvers;
+mod structs;
+mod transform;
+
+use crate::consts::*;
+use crate::utils;
+
+pub use structs::*;
+
+use glam::DVec2;
+use std::fmt::{Debug, Formatter, Result};
+
+/// Representation of the handle point(s) in a bezier segment.
+#[derive(Copy, Clone, PartialEq)]
+enum BezierHandles {
+	Linear,
+	/// Handles for a quadratic curve.
+	Quadratic {
+		/// Point representing the location of the single handle.
+		handle: DVec2,
+	},
+	/// Handles for a cubic curve.
+	Cubic {
+		/// Point representing the location of the handle associated to the start point.
+		handle_start: DVec2,
+		/// Point representing the location of the handle associated to the end point.
+		handle_end: DVec2,
+	},
+}
+
+/// Representation of a bezier curve with 2D points.
+#[derive(Copy, Clone, PartialEq)]
+pub struct Bezier {
+	/// Start point of the bezier curve.
+	start: DVec2,
+	/// Start point of the bezier curve.
+	end: DVec2,
+	/// Handles of the bezier curve.
+	handles: BezierHandles,
+}
+
+impl Debug for Bezier {
+	fn fmt(&self, f: &mut Formatter<'_>) -> Result {
+		write!(f, "{:?}", self.get_points().collect::<Vec<DVec2>>())
+	}
+}