qt: daemon now operates in the background thread; added Quit GUI button

qt/i2pd_qt/mainwindow.ui

@@ -1,7 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
  <class>MainWindow</class>
- <widget class="QMainWindow" name="MainWindow" >
-  <property name="geometry" >
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
@@ -9,13 +10,58 @@
     <height>480</height>
    </rect>
   </property>
-  <property name="windowTitle" >
+  <property name="windowTitle">
    <string>MainWindow</string>
   </property>
-  <widget class="QWidget" name="centralWidget" />
+  <widget class="QWidget" name="centralWidget">
+   <widget class="QWidget" name="verticalLayoutWidget">
+    <property name="geometry">
+     <rect>
+      <x>10</x>
+      <y>20</y>
+      <width>771</width>
+      <height>441</height>
+     </rect>
+    </property>
+    <layout class="QVBoxLayout" name="verticalLayout1">
+     <item>
+      <widget class="QPushButton" name="quitButton">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="MinimumExpanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="text">
+        <string>Quit</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </widget>
+  </widget>
  </widget>
- <layoutDefault spacing="6" margin="11" />
- <pixmapfunction></pixmapfunction>
+ <layoutdefault spacing="6" margin="11"/>
  <resources/>
- <connections/>
+ <connections>
+  <connection>
+   <sender>quitButton</sender>
+   <signal>released()</signal>
+   <receiver>MainWindow</receiver>
+   <slot>handleQuitButton()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>384</x>
+     <y>244</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>373</x>
+     <y>419</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+ <slots>
+  <slot>handleQuitButton()</slot>
+ </slots>
 </ui>