lobby: add sort by flag option, align player names in available players list

src/gui/qt/gamelobbydialog.ui

@@ -175,7 +175,7 @@
            <x>0</x>
            <y>0</y>
            <width>248</width>
-           <height>178</height>
+           <height>170</height>
           </rect>
          </property>
          <layout class="QGridLayout" name="gridLayout">
@@ -672,12 +672,12 @@
      </item>
     </layout>
    </item>
-   <item row="3" column="1">
+   <item row="3" column="1" rowspan="2">
     <widget class="QGroupBox" name="groupBox_lobbyChat">
      <property name="minimumSize">
       <size>
        <width>400</width>
-       <height>0</height>
+       <height>223</height>
       </size>
      </property>
      <property name="maximumSize">
@@ -714,7 +714,7 @@
      </layout>
     </widget>
    </item>
-   <item row="4" column="0" colspan="3">
+   <item row="5" column="0" colspan="3">
     <layout class="QHBoxLayout">
      <item>
       <widget class="QLabel" name="label_connectedPlayersCounter">
@@ -842,6 +842,25 @@ p, li { white-space: pre-wrap; }
      </property>
     </widget>
    </item>
+   <item row="4" column="0">
+    <widget class="QComboBox" name="comboBox_nickListFilter">
+     <item>
+      <property name="text">
+       <string>No sorting / filtering</string>
+      </property>
+     </item>
+     <item>
+      <property name="text">
+       <string>Sort by flag</string>
+      </property>
+     </item>
+     <item>
+      <property name="text">
+       <string>Filter idle players</string>
+      </property>
+     </item>
+    </widget>
+   </item>
   </layout>
  </widget>
  <tabstops>