Use artboard properties as transition conditions

Adding support for transition conditions based on artboard properties.
transition_artboard_condition extends from transition_viewmodel_condition.
It might be good to rename  transition_viewmodel_condition to transition_property_condition at some point since it is extensible enough to support viewmodels, but also with other properties like here.

Diffs=
93cc33b45 Use artboard properties as transition conditions (#7796)
c5fc07de9 Init NestedAnimation's nestedArtboard as nullptr (#7857)
fb7756072 added some simple windows build scripts to make building on windows from powershell or command prompt easier (#7800)
ed56d2de6 editor: nine-slicing core data type definitions (#7840)

Co-authored-by: hernan <hernan@rive.app>

.rive_head

@@ -1 +1 @@
-4fb978a9230fc006b5e575364f062907e7dd2afe
+93cc33b45086e528b22d1245a8f7855bac299a21

lib/src/generated/animation/transition_artboard_condition_base.dart

@@ -0,0 +1,19 @@
+// Core automatically generated
+// lib/src/generated/animation/transition_artboard_condition_base.dart.
+// Do not modify manually.
+
+import 'package:rive/src/generated/animation/transition_condition_base.dart';
+import 'package:rive/src/rive_core/animation/transition_viewmodel_condition.dart';
+
+abstract class TransitionArtboardConditionBase
+    extends TransitionViewModelCondition {
+  static const int typeKey = 497;
+  @override
+  int get coreType => TransitionArtboardConditionBase.typeKey;
+  @override
+  Set<int> get coreTypes => {
+        TransitionArtboardConditionBase.typeKey,
+        TransitionViewModelConditionBase.typeKey,
+        TransitionConditionBase.typeKey
+      };
+}

lib/src/generated/animation/transition_property_artboard_comparator_base.dart

@@ -0,0 +1,54 @@
+// Core automatically generated
+// nullnull
+// t.
+// Do not modify manually.
+
+import 'package:rive/src/core/core.dart';
+import 'package:rive/src/generated/animation/transition_comparator_base.dart';
+import 'package:rive/src/rive_core/animation/transition_property_comparator.dart';
+
+abstract class TransitionPropertyArtboardComparatorBase
+    extends TransitionPropertyComparator {
+  static const int typeKey = 496;
+  @override
+  int get coreType => TransitionPropertyArtboardComparatorBase.typeKey;
+  @override
+  Set<int> get coreTypes => {
+        TransitionPropertyArtboardComparatorBase.typeKey,
+        TransitionPropertyComparatorBase.typeKey,
+        TransitionComparatorBase.typeKey
+      };
+
+  /// --------------------------------------------------------------------------
+  /// PropertyType field with key 677.
+  static const int propertyTypePropertyKey = 677;
+  static const int propertyTypeInitialValue = 0;
+  int _propertyType = propertyTypeInitialValue;
+
+  /// Integer representation of the artboard's property used for condition
+  int get propertyType => _propertyType;
+
+  /// Change the [_propertyType] field value.
+  /// [propertyTypeChanged] will be invoked only if the field's value has
+  /// changed.
+  set propertyType(int value) {
+    if (_propertyType == value) {
+      return;
+    }
+    int from = _propertyType;
+    _propertyType = value;
+    if (hasValidated) {
+      propertyTypeChanged(from, value);
+    }
+  }
+
+  void propertyTypeChanged(int from, int to);
+
+  @override
+  void copy(Core source) {
+    super.copy(source);
+    if (source is TransitionPropertyArtboardComparatorBase) {
+      _propertyType = source._propertyType;
+    }
+  }
+}

lib/src/rive_core/animation/transition_artboard_condition.dart

@@ -0,0 +1,5 @@
+import 'package:rive/src/generated/animation/transition_artboard_condition_base.dart';
+
+export 'package:rive/src/generated/animation/transition_artboard_condition_base.dart';
+
+class TransitionArtboardCondition extends TransitionArtboardConditionBase {}