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.Server/Warps/WarpPointComponent.cs

@@ -3,6 +3,7 @@ using Robust.Shared.GameObjects;
 using Robust.Shared.Localization;
 using Robust.Shared.Serialization.Manager.Attributes;
 using Robust.Shared.Utility;
+using Robust.Shared.Utility.Markup;
 using Robust.Shared.ViewVariables;
 
 namespace Content.Server.Warps
@@ -16,7 +17,7 @@ namespace Content.Server.Warps
 
         [ViewVariables(VVAccess.ReadWrite)] [DataField("location")] public string? Location { get; set; }
 
-        public void Examine(FormattedMessage message, bool inDetailsRange)
+        public void Examine(FormattedMessage.Builder message, bool inDetailsRange)
         {
             var loc = Location == null ? "<null>" : $"'{Location}'";
             message.AddText(Loc.GetString("warp-point-component-on-examine-success", ("location", loc)));