feat: add initial implementation of compander UI widget

Author: timschneeb

src/MainWindow.ui

@@ -404,6 +404,16 @@
                    </layout>
                   </widget>
                  </item>
+                 <item>
+                  <widget class="LiquidCompanderWidget" name="widget" native="true">
+                   <property name="minimumSize">
+                    <size>
+                     <width>0</width>
+                     <height>150</height>
+                    </size>
+                   </property>
+                  </widget>
+                 </item>
                  <item>
                   <spacer name="verticalSpacer_4">
                    <property name="orientation">
@@ -2226,6 +2236,12 @@
    <extends>QLabel</extends>
    <header>interface/FadingLabel.h</header>
   </customwidget>
+  <customwidget>
+   <class>LiquidCompanderWidget</class>
+   <extends>QWidget</extends>
+   <header location="global">LiquidCompanderWidget.h</header>
+   <container>1</container>
+  </customwidget>
  </customwidgets>
  <tabstops>
   <tabstop>cpreset</tabstop>