Inline help feature (#4409)

* Help operator in grouping and filtering Panel

Opens up a webbrowser on click

* Help button on the right of filtering panel header

* replacing os.rename() by shutil.move in ifcpatch

* removing debug print from previous commit

* Removing extra operator
Using bim.open_uri to open help page

* Update docs url

* Clean up whitespace

---------

Co-authored-by: Dion Moult <dion@thinkmoult.com>

src/blenderbim/blenderbim/bim/ui.py

@@ -466,7 +466,7 @@ class BIM_PT_tab_grouping_and_filtering(Panel):
     bl_space_type = "PROPERTIES"
     bl_region_type = "WINDOW"
     bl_context = "scene"
-    bl_options = {"DEFAULT_CLOSED"}
+    bl_options = {"DEFAULT_CLOSED","HEADER_LAYOUT_EXPAND"}
 
     @classmethod
     def poll(cls, context):
@@ -475,6 +475,13 @@ class BIM_PT_tab_grouping_and_filtering(Panel):
     def draw(self, context):
         pass
 
+    def draw_header(self, context):
+        # Draws help button on the right
+        row = self.layout.row(align=True)
+        row.label(text="")  # empty text occupies the left of the row
+        row.operator("bim.open_uri", text="", icon="HELP").uri = \
+            "https://docs.ifcopenshell.org/ifcopenshell-python/selector_syntax.html"
+
 
 class BIM_PT_tab_geometry(Panel):
     bl_label = "Geometry"