Add new svg icons for Qt client

qt/PrefsDialog.ui

@@ -121,7 +121,7 @@
          <item>
           <widget class="QLabel" name="altSpeedLimitsSectionIconLabel">
            <property name="pixmap">
-            <pixmap resource="application.qrc">:/icons/alt-limit-off.png</pixmap>
+            <pixmap resource="application.qrc">:/icons/turtle.png</pixmap>
            </property>
           </widget>
          </item>

qt/application.qrc

@@ -12,10 +12,10 @@
       <file alias="transmission-192.png">icons/hicolor/192x192/transmission-qt.png</file>
       <file alias="transmission-256.png">icons/hicolor/256x256/transmission-qt.png</file>
       <file alias="transmission-qt.svg">icons/hicolor/scalable/transmission-qt.svg</file>
-      <file alias="ratio.png">icons/ratio.png</file>
-      <file alias="alt-limit-off.png">icons/turtle-grey.png</file>
-      <file alias="alt-limit-on.png">icons/turtle-blue.png</file>
-      <file alias="encrypted.png">icons/lock.png</file>
-      <file alias="utilities.png">icons/utilities.png</file>
+      <file alias="ratio.png">icons/ratio.svg</file>
+      <file alias="alt-limit-off.png">icons/turtle.svg</file>
+      <file alias="alt-limit-on.png">icons/turtle-blue.svg</file>
+      <file alias="encrypted.png">icons/lock.svg</file>
+      <file alias="utilities.png">icons/utilities.svg</file>
   </qresource>
 </RCC>