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/Scoreboards/Structures/Board.swift

@@ -1,11 +1,11 @@
 internal import CPlaydate
 
 extension Scoreboards {
-    /// A board belonging to the game.
+    /// One of the game's boards. Copied from `PDBoard`.
     public struct Board {
-        /// The board's identifier, used in the other scoreboard calls.
+        /// Passed as `boardID` to the other calls.
         public let boardID: String
-        /// The board's display name.
+        /// Display name.
         public let name: String
 
         init(_ board: PDBoard) {

Sources/PlaydateKit/Scoreboards/Structures/BoardsList.swift

@@ -1,11 +1,10 @@
 internal import CPlaydate
 
 extension Scoreboards {
-    /// The game's boards.
+    /// The game's boards. Copied from `PDBoardsList`.
     public struct BoardsList {
-        /// When the list was last updated, in seconds since the epoch.
+        /// Last update, in seconds since the epoch.
         public let lastUpdated: UInt32
-        /// The game's boards.
         public let boards: [Board]
 
         init(_ list: PDBoardsList) {

Sources/PlaydateKit/Scoreboards/Structures/Score.swift

@@ -1,15 +1,14 @@
 internal import CPlaydate
 
 extension Scoreboards {
-    /// A score on a board.
+    /// A score on a board. Copied from `PDScore` or `PDListScore`.
     public struct Score {
-        /// The score's position on the board, starting at 1.
+        /// Position on the board, from 1.
         public let rank: UInt32
-        /// The score's value.
         public let value: UInt32
-        /// The name of the player who posted the score.
+        /// Name of the player who posted it.
         public let player: String
-        /// The board the score belongs to, when known.
+        /// `nil` if the C API gave none.
         public let boardID: String?
 
         init(_ score: PDScore) {

Sources/PlaydateKit/Scoreboards/Structures/ScoresList.swift

@@ -1,17 +1,16 @@
 internal import CPlaydate
 
 extension Scoreboards {
-    /// The scores on a board.
+    /// The scores on a board. Copied from `PDScoresList`.
     public struct ScoresList {
-        /// The board the scores belong to.
         public let boardID: String
-        /// When the list was last updated, in seconds since the epoch.
+        /// Last update, in seconds since the epoch.
         public let lastUpdated: UInt32
-        /// Whether the current player's score is included in the list.
+        /// Whether the current player's score is in the list.
         public let playerIncluded: Bool
-        /// The maximum number of scores the list can hold.
+        /// Maximum number of scores the list can hold.
         public let limit: UInt32
-        /// The scores, ordered by rank.
+        /// Ordered by rank.
         public let scores: [Score]
 
         init(_ list: PDScoresList) {