Admin Tool: Observe entities in an extra viewport (#36969)

* camera

* add console command

* change verb name to camera

* placeholder text

* add button to player panel

* orks are indeed the best

* visibility flag fix

* not a datafield

* more follower fixes

* more cleanup

* add zooming

* resizing real

* remove commented out code

* remove AddForceSend

* comment

* Use OS window and add some comments

* fix comments and variable name

* Needs RT update

* Minor grammarchange

* Fix warning

* Cleanup

* almost working...

* fix bug

* oswindow update

* Remove need for RequestClosed.

---------

Co-authored-by: beck-thompson <beck314159@hotmail.com>
Co-authored-by: PJB3005 <pieterjan.briers+git@gmail.com>

Content.Client/Administration/UI/AdminCamera/AdminCameraControl.xaml

@@ -0,0 +1,20 @@
+<Control
+    xmlns="https://spacestation14.io"
+    xmlns:viewport="clr-namespace:Content.Client.Viewport"
+    MouseFilter="Stop">
+    <PanelContainer StyleClasses="BackgroundDark" Name="AdminCameraWindowRoot" Access="Public">
+        <BoxContainer Orientation="Vertical" Access="Public">
+            <!-- Camera -->
+            <Control VerticalExpand="True" Name="CameraViewBox">
+                <viewport:ScalingViewport Name="CameraView"
+                                          MinSize="100 100"
+                                          MouseFilter="Ignore" />
+            </Control>
+            <!-- Controller buttons -->
+            <BoxContainer Orientation="Horizontal" Margin="5 5 5 5">
+                <Button StyleClasses="OpenRight" Name="FollowButton" HorizontalExpand="True" Access="Public" Text="{Loc 'admin-camera-window-follow'}" />
+                <Button StyleClasses="OpenLeft" Name="PopControl" HorizontalExpand="True" Access="Public" Text="{Loc 'admin-camera-window-pop-out'}" />
+            </BoxContainer>
+        </BoxContainer>
+    </PanelContainer>
+</Control>