Add "source" field to WidgetAsset message in project.proto

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/project/serial/ProtobufProjectSerializer.kt

@@ -63,6 +63,7 @@ class ProtobufProjectSerializer : ProjectSerializer {
 
    private fun serializeWidget(widget: WidgetAsset) = ProjectProto.WidgetAsset.newBuilder()
       .setUid(widget.uid)
+      .setSource(widget.source)
       .setName(widget.name)
       .build()
 }

proto/src/main/proto/project.proto

@@ -50,5 +50,6 @@ message FontAsset {
 
 message WidgetAsset {
   required string uid = 1;
+  required string source = 2;
   required string name = 3;
 }