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/Botany/Components/SeedComponent.cs

@@ -5,6 +5,7 @@ using Robust.Shared.Localization;
 using Robust.Shared.Prototypes;
 using Robust.Shared.Serialization.Manager.Attributes;
 using Robust.Shared.Utility;
+using Robust.Shared.Utility.Markup;
 using Robust.Shared.ViewVariables;
 
 namespace Content.Server.Botany.Components
@@ -26,7 +27,7 @@ namespace Content.Server.Botany.Components
             set => _seedName = value?.ID;
         }
 
-        public void Examine(FormattedMessage message, bool inDetailsRange)
+        public void Examine(FormattedMessage.Builder message, bool inDetailsRange)
         {
             if (!inDetailsRange)
                 return;