Updated stylesheet to provide uniform look of icons for all platforms

added detach-button icon

Author: githubuser0xFFFF

src/ads.qrc

@@ -7,5 +7,8 @@
         <file>images/close-button-focused.svg</file>
         <file>stylesheets/focus_highlighting.css</file>
         <file>stylesheets/focus_highlighting_linux.css</file>
+        <file>images/tabs-menu-button.svg</file>
+        <file>images/detach-button.svg</file>
+        <file>images/detach-button-disabled.svg</file>
     </qresource>
 </RCC>