BIM: Reworked preferences and setup screens

* Reworded welcome screen, removed "update" section
* Removed Webtools and Start option from setup dialog - fixes #14179
* Renamed Arch preferecnes to BIM - fixes #14121
* Moved NativeIFC preferences to BIM - fixes #14137

src/Mod/BIM/Resources/ui/preferences-ifc-export.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>534</width>
-    <height>691</height>
+    <height>718</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -369,6 +369,13 @@ unit to work with when opening the file.</string>
         </item>
        </layout>
       </item>
+      <item>
+       <widget class="QLabel" name="label_3">
+        <property name="text">
+         <string>Check also NativeIFC-specific preferences under BIM -&gt; NativeIFC</string>
+        </property>
+       </widget>
+      </item>
      </layout>
     </widget>
    </item>