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/Network/Enumerations/NetError.swift

@@ -1,31 +1,47 @@
 internal import CPlaydate
 
 extension Network {
-    /// A network error code (`PDNetErr`).
+    /// A network error. Wraps the negative `PDNetErr` codes.
     public enum NetError: Int32, Swift.Error, Sendable {
+        /// `NET_NO_DEVICE`.
         case noDevice = -1
+        /// `NET_BUSY`.
         case busy = -2
+        /// `NET_WRITE_ERROR`.
         case writeError = -3
+        /// `NET_WRITE_BUSY`.
         case writeBusy = -4
+        /// `NET_WRITE_TIMEOUT`.
         case writeTimeout = -5
+        /// `NET_READ_ERROR`.
         case readError = -6
+        /// `NET_READ_BUSY`.
         case readBusy = -7
+        /// `NET_READ_TIMEOUT`.
         case readTimeout = -8
+        /// `NET_READ_OVERFLOW`.
         case readOverflow = -9
+        /// `NET_FRAME_ERROR`.
         case frameError = -10
+        /// `NET_BAD_RESPONSE`.
         case badResponse = -11
+        /// `NET_ERROR_RESPONSE`.
         case errorResponse = -12
+        /// `NET_RESET_TIMEOUT`.
         case resetTimeout = -13
+        /// `NET_BUFFER_TOO_SMALL`.
         case bufferTooSmall = -14
+        /// `NET_UNEXPECTED_RESPONSE`.
         case unexpectedResponse = -15
+        /// `NET_NOT_CONNECTED_TO_AP`.
         case notConnectedToAP = -16
+        /// `NET_NOT_IMPLEMENTED`.
         case notImplemented = -17
+        /// `NET_CONNECTION_CLOSED`.
         case connectionClosed = -18
-        /// An error code not covered by `PDNetErr`.
+        /// A code not in `PDNetErr`.
         case unknown = 1
 
-        /// Creates an error from the C code, or `.unknown` for
-        /// unrecognized codes.
         init(_ error: PDNetErr) {
             self = NetError(rawValue: Int32(error.rawValue)) ?? .unknown
         }