PDA UI refactor and cartridges (#11335)

* Work on cartridges

* Work on PDA UI

* Work on PDA UIs program list

* Work on PDA UI borders

* Add DeviceNetworkingComponent to the pda base prototype

* Fix submodule version

* Fix cartridge loader ui key

* Fix pda menu xaml

* Implement relaying ui messages

* Finish implementing the notekeeper cartridge

* Fix submodule version

* Fix errors from merging master

* Fix test failing

* Implement setting preinstalled programs

* Add some documentation to CartridgeLoaderSystem

* Add more doc comments

* Add localization to program names

* Implement review suggestions

* Fix background programs receiving events twice when active

Content.Client/Stylesheets/StyleBase.cs

@@ -38,6 +38,7 @@ namespace Content.Client.Stylesheets
         protected StyleBoxTexture BaseButtonSquare { get; }
 
         protected StyleBoxTexture BaseAngleRect { get; }
+        protected StyleBoxTexture AngleBorderRect { get; }
 
         protected StyleBase(IResourceCache resCache)
         {
@@ -114,6 +115,12 @@ namespace Content.Client.Stylesheets
             };
             BaseAngleRect.SetPatchMargin(StyleBox.Margin.All, 10);
 
+            AngleBorderRect = new StyleBoxTexture
+            {
+                Texture = resCache.GetTexture("/Textures/Interface/Nano/geometric_panel_border.svg.96dpi.png"),
+            };
+            AngleBorderRect.SetPatchMargin(StyleBox.Margin.All, 10);
+
             var vScrollBarGrabberNormal = new StyleBoxFlat
             {
                 BackgroundColor = Color.Gray.WithAlpha(0.35f), ContentMarginLeftOverride = DefaultGrabberSize,