WIP: add icon

src/gui/about_dialog/about_dialog.ui

@@ -20,7 +20,32 @@
    <item>
     <layout class="QVBoxLayout" name="verticalLayout">
      <item>
-      <layout class="QHBoxLayout" name="horizontalLayout"/>
+      <layout class="QHBoxLayout" name="horizontalLayout">
+       <item>
+        <widget class="QPushButton" name="pushButton">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+         <property name="text">
+          <string/>
+         </property>
+         <property name="icon">
+          <iconset>
+           <normaloff>../../resources/xtandempipeline_icon.svg</normaloff>../../resources/xtandempipeline_icon.svg</iconset>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QLabel" name="label">
+         <property name="text">
+          <string>X!Tandem Pipeline C++</string>
+         </property>
+        </widget>
+       </item>
+      </layout>
      </item>
      <item>
       <widget class="QTextBrowser" name="textBrowser">