Fixed bugs found for the bitmap mask, JSON reader and wifi wrappers in the library.

Sources/PlaydateKit/Graphics/Classes/Bitmap.swift

@@ -2,15 +2,18 @@ internal import CPlaydate
 
 extension Graphics {
     /// A drawable image and drawing target. Wraps `LCDBitmap`. Bitmaps borrowed from
-    /// tables, fonts, masks, video players, or the system live only as long as their owner.
+    /// tables, fonts, video players, or the system live only as long as their owner.
     public final class Bitmap {
         let pointer: OpaquePointer
         /// Whether deinit frees the `LCDBitmap`.
         let isOwned: Bool
+        /// Kept alive because this bitmap shares its pixels.
+        private let owner: Bitmap?
 
-        init(pointer: OpaquePointer, isOwned: Bool) {
+        init(pointer: OpaquePointer, isOwned: Bool, owner: Bitmap? = nil) {
             self.pointer = pointer
             self.isOwned = isOwned
+            self.owner = owner
         }
 
         public convenience init(width: Int, height: Int, backgroundColor: Color = .clear) {
@@ -126,10 +129,11 @@ extension Graphics {
             gfx.pointee.setBitmapMask.unsafelyUnwrapped(pointer, mask?.pointer) != 0
         }
 
-        /// Shares this bitmap's mask data: drawing into it edits the mask.
+        /// Shares this bitmap's mask data, and keeps this bitmap alive.
         public var mask: Bitmap? {
+            // Owned by the caller; pixels are shared with `self`.
             guard let mask = gfx.pointee.getBitmapMask.unsafelyUnwrapped(pointer) else { return nil }
-            return Bitmap(pointer: mask, isOwned: false)
+            return Bitmap(pointer: mask, isOwned: true, owner: self)
         }
 
         /// Whether opaque pixels of both bitmaps overlap within the non-empty `rect`.