Add sorting the admin player panel by clicking the headers (#7150)

Content.Client/Administration/UI/Tabs/PlayerTab/PlayerTabHeader.xaml

@@ -0,0 +1,36 @@
+<ContainerButton xmlns="https://spacestation14.io"
+                 xmlns:cc="clr-namespace:Content.Client.Administration.UI.CustomControls"
+                 EnableAllKeybinds="True">
+    <PanelContainer Name="BackgroundColorPanel" Access="Public"/>
+    <BoxContainer Orientation="Horizontal"
+                  HorizontalExpand="True"
+                  SeparationOverride="4">
+        <Label Name="UsernameLabel"
+               SizeFlagsStretchRatio="3"
+               HorizontalExpand="True"
+               ClipText="True"
+               Text="{Loc player-tab-username}"
+               MouseFilter="Pass"/>
+        <cc:VSeparator/>
+        <Label Name="CharacterLabel"
+               SizeFlagsStretchRatio="3"
+               HorizontalExpand="True"
+               ClipText="True"
+               Text="{Loc player-tab-character}"
+               MouseFilter="Pass"/>
+        <cc:VSeparator/>
+        <Label Name="JobLabel"
+               SizeFlagsStretchRatio="3"
+               HorizontalExpand="True"
+               ClipText="True"
+               Text="{Loc player-tab-job}"
+               MouseFilter="Pass"/>
+        <cc:VSeparator/>
+        <Label Name="AntagonistLabel"
+               SizeFlagsStretchRatio="2"
+               HorizontalExpand="True"
+               ClipText="True"
+               Text="{Loc player-tab-antagonist}"
+               MouseFilter="Pass"/>
+    </BoxContainer>
+</ContainerButton>