[Entity] Brig Timers (#15285)

* brigtimer

* ok

* TextScreen w timer implementation

* second commit

* working brig timer

* signal timers near completion

* soon done

* removed licenses, fixes noRotation on screens, minor edits

* no message

* no message

* removed my last todos

* removed csproj.rej??

* missed a thing with .yml and tests

* fix tests

* Update base_structureairlocks.yml

* timespan type serialize

* activation turned into comp

* sloth review

* Update timer.yml

* small changes

---------

Co-authored-by: CommieFlowers <rasmus.cedergren@hotmail.com>
Co-authored-by: rolfero <45628623+rolfero@users.noreply.github.com>

Content.Client/TextScreen/TextScreenTimerComponent.cs

@@ -0,0 +1,10 @@
+namespace Content.Client.TextScreen;
+
+/// <summary>
+/// This is an active component for tracking <see cref="TextScreenVisualsComponent"/>
+/// </summary>
+[RegisterComponent]
+public sealed class TextScreenTimerComponent : Component
+{
+
+}