Remove Knob related code and examples

Author: georgweiss

app/display/editor/src/main/resources/display_editor_preferences.properties

@@ -11,7 +11,7 @@
 # discourage adding them to new displays.
 
 # Hiding widgets where representation has not been imported because of dependencies
-hidden_widget_types=linear-meter,knob,gauge,clock,digital_clock
+hidden_widget_types=linear-meter,gauge,clock,digital_clock
 #
 #
 # GUI Menu action Applications / Display / New Display opens the following template

app/display/model/src/main/java/org/csstudio/display/builder/model/BaseWidgetsService.java

@@ -25,7 +25,6 @@
 import org.csstudio.display.builder.model.widgets.EmbeddedDisplayWidget;
 import org.csstudio.display.builder.model.widgets.FileSelectorWidget;
 import org.csstudio.display.builder.model.widgets.GroupWidget;
-import org.csstudio.display.builder.model.widgets.KnobWidget;
 import org.csstudio.display.builder.model.widgets.LEDWidget;
 import org.csstudio.display.builder.model.widgets.LabelWidget;
 import org.csstudio.display.builder.model.widgets.MeterWidget;
@@ -82,7 +81,6 @@ public Collection<WidgetDescriptor> getWidgetDescriptors()
             FileSelectorWidget.WIDGET_DESCRIPTOR,
             GroupWidget.WIDGET_DESCRIPTOR,
             ImageWidget.WIDGET_DESCRIPTOR,
-            KnobWidget.WIDGET_DESCRIPTOR,
             LabelWidget.WIDGET_DESCRIPTOR,
             LEDWidget.WIDGET_DESCRIPTOR,
             MeterWidget.WIDGET_DESCRIPTOR,

app/display/model/src/main/java/org/csstudio/display/builder/model/widgets/KnobWidget.java

@@ -60,8 +60,6 @@ public class ScaledSliderWidget extends WritablePVWidget
             "Scaled Slider",
             "/icons/scaled_slider.png",
             "A scaled slider that can read/write a numeric PV",
-            // Can also represent "org.csstudio.opibuilder.widgets.knob",
-            // but using KnobWidget for that
             Arrays.asList("org.csstudio.opibuilder.widgets.scaledslider"))
     {
         @Override

app/display/model/src/main/java/org/csstudio/display/builder/model/widgets/ScaledSliderWidget.java

@@ -571,26 +571,6 @@ then press &lt;SPACE&gt; to activate button.</text>
     <height>26</height>
     <tooltip>$(actions)</tooltip>
   </widget>
-  <widget type="action_button" version="3.0.0">
-    <name>Action Button_33</name>
-    <actions>
-      <action type="open_display">
-        <file>controls_knob.bob</file>
-        <target>replace</target>
-        <description>Knob</description>
-      </action>
-    </actions>
-    <x>470</x>
-    <y>440</y>
-    <width>120</width>
-    <height>26</height>
-    <scripts>
-      <script file="scripts/disable_missing.py">
-        <pv_name>loc://knob("knob")</pv_name>
-      </script>
-    </scripts>
-    <tooltip>$(actions)</tooltip>
-  </widget>
   <widget type="action_button" version="3.0.0">
     <name>Action Button_34</name>
     <actions>