Make detailed version information available to command line (#257)

- Moved detailed version information from ReportBugDialog to Version::details()
- Added QPA Platform information to verbose version information
- Added Qt version to detailed version information
- Added `-V` command line option to glabels-qt and glabels-batch-qt

glabels/ui/ReportBugDialog.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>586</width>
-    <height>675</height>
+    <height>730</height>
    </rect>
   </property>
   <property name="sizePolicy">
@@ -119,7 +119,7 @@
         <property name="minimumSize">
          <size>
           <width>400</width>
-          <height>250</height>
+          <height>290</height>
          </size>
         </property>
         <property name="acceptRichText">
@@ -151,7 +151,8 @@
            <string>Copy</string>
           </property>
           <property name="icon">
-           <iconset theme="glabels-edit-copy"/>
+           <iconset theme="glabels-edit-copy">
+            <normaloff>.</normaloff>.</iconset>
           </property>
           <property name="iconSize">
            <size>
@@ -200,7 +201,7 @@
      <property name="sizeHint" stdset="0">
       <size>
        <width>20</width>
-       <height>118</height>
+       <height>20</height>
       </size>
      </property>
     </spacer>