appimage-starter (#42)

create program launcher;
reduced size of appimage;
download of appimages working(?)

Co-authored-by: Dominik Demuth <dominik.demuth@physik.tu-darmstadt.de>
Reviewed-on: #42

src/resources/_ui/basewindow.ui

@@ -263,6 +263,7 @@
     <addaction name="separator"/>
     <addaction name="action_colorcycle"/>
     <addaction name="actionConfiguration"/>
+    <addaction name="actionCreate_starter"/>
    </widget>
    <widget class="QMenu" name="menuWindow">
     <property name="title">
@@ -999,6 +1000,11 @@
     <string>Show error log</string>
    </property>
   </action>
+  <action name="actionCreate_starter">
+   <property name="text">
+    <string>Create starter..</string>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>