feat!: Dart SDK compatibility (#77)

# Description
This PR makes this package compatible with the Dart SDK. In order to
achieve this I changed 3 things:
- Replace `dart:ui`'s Color with a simple ColorData class
- Replaced `Rect` from `flame` with `Rectangle` from `dart:math`
- Replaced `flutter_test` with `test` package

The `ColorData` class is used excatly once for which I prepared a
flame_tiled PR (however I need to wait until this is merged right)
including conversion extensions.

No `Rectangle` attribute is ever read in `flame_tiled`, evenso `flame`
already contains conversion extensions!

## Checklist
- [x] The title of my PR starts with a [Conventional Commit] prefix
(`fix:`, `feat:`, `docs:` etc).
- [x] I have read the [Contributor Guide] and followed the process
outlined for submitting PRs.
--> `melos run analyze` fails due to `XmlData.value` however I think
this requires another issue/PR
- [x] I have updated/added tests for ALL new/updated/fixed
functionality.
- [x] I have updated/added relevant documentation in `docs` and added
dartdoc comments with `///`.
- [x] I have updated/added relevant examples in `examples`.
  --> I don't think there are any exmaples necessary for this

## Breaking Change
- [x] Yes, this is a breaking change.
- [ ] No, this is *not* a breaking change.

I think this should result in a minor version bump to 0.11.0 to indicate
these breaking changes!

In order to achieve dart comaptibilty only two things changed:
- Color: Custom data class --> `flame_tiled` contains a conversion
extension
- Rect: Instead using `dart:math`'s Rectangle --> Use `flame`'s
`toRect()` method to convert

## Related Issues
- #69

---------

Co-authored-by: benni-tec <[email protected]>
Co-authored-by: Lukas Klingsbo <[email protected]>

Author: 3 people

packages/tiled/lib/src/chunk.dart

@@ -1,4 +1,4 @@
-part of '../tiled.dart';
+import 'package:tiled/tiled.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/common/color.dart

@@ -0,0 +1,53 @@
+import 'package:meta/meta.dart';
+
+/// Basic data class holding a Color in ARGB format.
+/// This can be converted to dart:ui's Color using the flame_tiled package
+@immutable
+class ColorData {
+  static int _sub(int hex, int index) => (hex >> index * 8) & 0x000000ff;
+
+  final int _hex;
+
+  int get alpha => _sub(_hex, 3);
+
+  int get red => _sub(_hex, 2);
+
+  int get green => _sub(_hex, 1);
+
+  int get blue => _sub(_hex, 0);
+
+  /// Parses the Color from an int using the lower 32-bits and tiled's format:
+  /// 0xaarrggbb
+  const ColorData.hex(this._hex);
+
+  const ColorData.rgb(int red, int green, int blue, [int alpha = 255])
+      : assert(red >= 0 && red <= 255),
+        assert(green >= 0 && green <= 255),
+        assert(blue >= 0 && blue <= 255),
+        assert(alpha >= 0 && alpha <= 255),
+        _hex = (alpha << 3 * 8) +
+            (red << 2 * 8) +
+            (green << 1 * 8) +
+            (blue << 0 * 8);
+
+  const ColorData.argb(int alpha, int red, int green, int blue)
+      : assert(red >= 0 && red <= 255),
+        assert(green >= 0 && green <= 255),
+        assert(blue >= 0 && blue <= 255),
+        assert(alpha >= 0 && alpha <= 255),
+        _hex = (alpha << 3 * 8) +
+            (red << 2 * 8) +
+            (green << 1 * 8) +
+            (blue << 0 * 8);
+
+  @override
+  bool operator ==(Object other) {
+    if (other is! ColorData) {
+      return false;
+    }
+    return _hex == other._hex;
+  }
+
+  @override
+  int get hashCode => _hex.hashCode;
+}

packages/tiled/lib/src/common/enums.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/src/parser.dart';
 
 enum MapOrientation { orthogonal, isometric, staggered, hexagonal }
 

packages/tiled/lib/src/common/flips.dart

@@ -1,5 +1,3 @@
-part of '../../tiled.dart';
-
 class Flips {
   final bool horizontally;
   final bool vertically;

packages/tiled/lib/src/common/frame.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/src/parser.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/common/gid.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/tiled.dart';
 
 /// A [Gid], Global Tile ID is a Tiled concept to represent the tiles inside
 /// int matrices. This wrapper is used by [Layer] and [Chunk] to provide

packages/tiled/lib/src/common/point.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/src/parser.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/common/property.dart

@@ -1,4 +1,6 @@
-part of '../../tiled.dart';
+import 'package:collection/collection.dart';
+import 'package:tiled/tiled.dart';
+import 'package:xml/xml.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:
@@ -37,7 +39,10 @@ class Property<T> {
       case PropertyType.color:
         return ColorProperty(
           name: name,
-          value: parser.getColor('value', defaults: const Color(0x00000000)),
+          value: parser.getColor(
+            'value',
+            defaults: const ColorData.hex(0x00000000),
+          ),
           hexValue: parser.getString('value', defaults: '#00000000'),
         );
 
@@ -156,7 +161,7 @@ class ObjectProperty extends Property<int> {
 }
 
 /// [value] is the color
-class ColorProperty extends Property<Color> {
+class ColorProperty extends Property<ColorData> {
   final String hexValue;
 
   ColorProperty({

packages/tiled/lib/src/common/tiled_image.dart

@@ -1,4 +1,5 @@
-part of '../../tiled.dart';
+import 'package:meta/meta.dart';
+import 'package:tiled/src/parser.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/editor_setting/chunk_size.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/src/parser.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files: