Decouple the engine from Flutter entirely

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

packages/wolf_3d_data/lib/src/io/engine_input.dart

@@ -0,0 +1,11 @@
+import 'package:wolf_3d_entities/wolf_3d_entities.dart';
+
+class EngineInput {
+  bool isMovingForward = false;
+  bool isMovingBackward = false;
+  bool isTurningLeft = false;
+  bool isTurningRight = false;
+  bool isInteracting = false;
+  bool isFiring = false;
+  WeaponType? requestedWeapon;
+}

packages/wolf_3d_data/lib/wolf_3d_data.dart

@@ -3,5 +3,6 @@
 /// More dartdocs go here.
 library;
 
+export 'src/io/engine_input.dart';
 export 'src/wl_parser.dart' show WLParser;
 export 'src/wolfenstein_loader.dart' show WolfensteinLoader;

packages/wolf_3d_data/pubspec.yaml

@@ -12,6 +12,7 @@ publish_to: none
 
 dependencies:
   wolf_3d_data_types:
+  wolf_3d_entities:
 
 dev_dependencies:
   lints: ^6.0.0