highlight: fixes and improvements

This patch allows highlights to be included in posts as well as removes context
when creating a highlight. Highlights now route as the root and selecting the
highlight in root routes to the highlighted event.

Signed-off-by: ericholguin <ericholguin@apache.org>

damus/Models/ContentFilters.swift

@@ -16,7 +16,7 @@ enum FilterState : Int {
     func filter(ev: NostrEvent) -> Bool {
         switch self {
         case .posts:
-            return ev.known_kind == .boost || !ev.is_reply()
+            return ev.known_kind == .boost || ev.known_kind == .highlight || !ev.is_reply()
         case .posts_and_replies:
             return true
         }