Everything: Rich text redux (#5625)

* lord save me

* UI/ChatBox: Use the new `defStyle` param for `RenderMarkup`

The previous iteration didn't work because `AddMessage` can't inherit
its color from the PushColor (since we're not doing actual tag stacks
anymore).

* rebase touchup

Content.Client/Info/ServerInfo.cs

@@ -6,6 +6,7 @@ using Robust.Client.UserInterface.Controls;
 using Robust.Shared.IoC;
 using Robust.Shared.Localization;
 using Robust.Shared.Utility;
+using Robust.Shared.Utility.Markup;
 
 namespace Content.Client.Info
 {
@@ -62,7 +63,7 @@ namespace Content.Client.Info
 
         public void SetInfoBlob(string markup)
         {
-            _richTextLabel.SetMessage(FormattedMessage.FromMarkup(markup));
+            _richTextLabel.SetMessage(Basic.RenderMarkup(markup));
         }
     }
 }