added Creator plugin for tvpaint and it's creator are using it

pype/hosts/tvpaint/api/plugin.py

@@ -0,0 +1,6 @@
+from pype.api import PypeCreatorMixin
+from avalon.tvpaint import pipeline
+
+
+class Creator(PypeCreatorMixin, pipeline.Creator):
+    pass

pype/hosts/tvpaint/plugins/create/create_render_layer.py

@@ -1,7 +1,8 @@
 from avalon.tvpaint import pipeline, lib
+from pype.hosts.tvpaint.api import plugin
 
 
-class CreateRenderlayer(pipeline.Creator):
+class CreateRenderlayer(plugin.Creator):
     """Mark layer group as one instance."""
     name = "render_layer"
     label = "RenderLayer"

pype/hosts/tvpaint/plugins/create/create_render_pass.py

@@ -1,7 +1,8 @@
 from avalon.tvpaint import pipeline, lib
+from pype.hosts.tvpaint.api import plugin
 
 
-class CreateRenderPass(pipeline.Creator):
+class CreateRenderPass(plugin.Creator):
     """Render pass is combination of one or more layers from same group.
 
     Requirement to create Render Pass is to have already created beauty

pype/hosts/tvpaint/plugins/create/create_review.py

@@ -1,7 +1,8 @@
 from avalon.tvpaint import pipeline
+from pype.hosts.tvpaint.api import plugin
 
 
-class CreateReview(pipeline.Creator):
+class CreateReview(plugin.Creator):
     """Review for global review of all layers."""
     name = "review"
     label = "Review"