Make authors email clickable & selectable

src/gui/about.ui

@@ -106,7 +106,13 @@
           <item row="2" column="1">
            <widget class="QLabel" name="label_19">
             <property name="text">
-             <string notr="true">sledgehammer999@qbittorrent.org</string>
+             <string notr="true">&lt;a href=&quot;mailto:sledgehammer999@qbittorrent.org&quot;&gt;sledgehammer999@qbittorrent.org&lt;/a&gt;</string>
+            </property>
+            <property name="openExternalLinks">
+             <bool>true</bool>
+            </property>
+            <property name="textInteractionFlags">
+             <set>Qt::LinksAccessibleByMouse|Qt::TextSelectableByMouse</set>
             </property>
            </widget>
           </item>
@@ -177,7 +183,13 @@
           <item row="2" column="1">
            <widget class="QLabel" name="label_6">
             <property name="text">
-             <string notr="true">chris@qbittorrent.org</string>
+             <string notr="true">&lt;a href=&quot;mailto:chris@qbittorrent.org&quot;&gt;chris@qbittorrent.org&lt;/a&gt;</string>
+            </property>
+            <property name="openExternalLinks">
+             <bool>true</bool>
+            </property>
+            <property name="textInteractionFlags">
+             <set>Qt::LinksAccessibleByMouse|Qt::TextSelectableByMouse</set>
             </property>
            </widget>
           </item>