Swift 6.4 migration and exhancements (#1)

This PR contains the work done to update the library and the attached example project to use the Swift 6.4 computer as a minimum supported version and also, to use the latest features introduced in it.

Reviewed-on: #1
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>

Sources/PlaydateKit/Sprite/Structures/CollisionInfo.swift

@@ -1,28 +1,25 @@
 internal import CPlaydate
 
 extension Sprite {
-    /// Information about a single collision, mirroring `SpriteCollisionInfo`.
+    /// A single collision. Wraps `SpriteCollisionInfo`.
     public struct CollisionInfo {
         /// The sprite being moved.
         public let sprite: Sprite
-        /// The sprite it collided with.
         public let other: Sprite
-        /// The collision response used.
         public let response: CollisionResponse
-        /// `true` if the sprites were overlapping when the collision
-        /// started; `false` if the sprite tunneled through.
+        /// `true` if already overlapping `other` at the start; `false` if it tunneled through.
         public let overlaps: Bool
-        /// How far along the movement (0...1) the collision occurred.
+        /// Fraction of the move to the goal done at the collision, 0...1.
         public let ti: Float
-        /// The difference between the requested and actual positions.
+        /// Difference between the original and actual positions at the collision.
         public let move: (x: Float, y: Float)
-        /// The collision normal (each component -1, 0, or 1).
+        /// Components usually -1, 0, or 1.
         public let normal: (x: Int, y: Int)
-        /// Where the sprite started touching `other`.
+        /// Where `sprite` started touching `other`.
         public let touch: (x: Float, y: Float)
-        /// The sprite's rect at the moment of the touch.
+        /// `sprite`'s rect at the touch.
         public let spriteRect: Rect
-        /// `other`'s rect at the moment of the touch.
+        /// `other`'s rect at the touch.
         public let otherRect: Rect
 
         init(_ info: SpriteCollisionInfo) {

Sources/PlaydateKit/Sprite/Structures/QueryInfo.swift

@@ -1,13 +1,12 @@
 internal import CPlaydate
 
 extension Sprite {
-    /// Information about a sprite intersected by a line segment,
-    /// mirroring `SpriteQueryInfo`.
+    /// A sprite intersected by a line segment. Wraps `SpriteQueryInfo`.
     public struct QueryInfo {
         public let sprite: Sprite
-        /// How far along the segment (0...1) the segment enters the sprite.
+        /// Entry point's position along the segment, 0...1.
         public let ti1: Float
-        /// How far along the segment (0...1) the segment exits the sprite.
+        /// Exit point's position along the segment, 0...1.
         public let ti2: Float
         public let entryPoint: (x: Float, y: Float)
         public let exitPoint: (x: Float, y: Float)

Sources/PlaydateKit/Sprite/Structures/Rect.swift

@@ -1,13 +1,14 @@
 internal import CPlaydate
 
-/// A floating-point rectangle mirroring `PDRect`.
+/// A floating-point rectangle, in pixels. Wraps `PDRect`.
 public struct Rect: Sendable {
+    /// Left edge.
     public var x: Float
+    /// Top edge.
     public var y: Float
     public var width: Float
     public var height: Float
 
-    /// Creates a rect from an origin and size.
     public init(x: Float, y: Float, width: Float, height: Float) {
         self.x = x
         self.y = y