first commit, transfer connect selected to file out from gp_render

ui.py

@@ -0,0 +1,27 @@
+import bpy
+
+from bpy.types import Panel
+
+
+class RT_PT_gp_node_ui(Panel):
+    bl_space_type = "NODE_EDITOR"
+    bl_region_type = "UI"
+    bl_category = "Render"
+    bl_label = "Render Toolbox"
+
+    def draw(self, context):
+        layout = self.layout
+        layout.operator("rt.connect_selected_to_file_out", icon="NODE")
+
+
+classes = (
+RT_PT_gp_node_ui,
+)
+
+def register():
+    for cls in classes:
+        bpy.utils.register_class(cls)
+
+def unregister():
+    for cls in reversed(classes):
+        bpy.utils.unregister_class(cls)