Move/Rename stuff (#11209)

-     Change namespace, and folder of FancyWindow to Content.Client.UserInterface.Controls
-     Change xaml reference from ui to controls in some places
-     Change ClientAlertsSystem from internal to public
-     Change namespace, and folder of HighDivider to Content.Client.UserInterface.Controls

Content.Client/Shuttles/UI/ShuttleConsoleWindow.xaml

@@ -1,5 +1,5 @@
-<userInterface:FancyWindow xmlns="https://spacestation14.io"
-                           xmlns:userInterface="clr-namespace:Content.Client.UserInterface"
+<controls:FancyWindow xmlns="https://spacestation14.io"
+                           xmlns:controls="clr-namespace:Content.Client.UserInterface.Controls"
                            xmlns:ui="clr-namespace:Content.Client.Shuttles.UI"
                            xmlns:ui1="clr-namespace:Content.Client.HUD.UI"
                            Title="{Loc 'shuttle-console-window-title'}">
@@ -97,4 +97,4 @@
                     Disabled="True"/>
         </BoxContainer>
     </GridContainer>
-</userInterface:FancyWindow>
+</controls:FancyWindow>