Adds hidden words filter to search, hashtag and geotag feeds

Applies hidden words even to hashtags that were not included in the content of the event.
Pre-process search to avoid showing and hiding posts after hidden words where processed by the UI.

quartz/src/main/java/com/vitorpamplona/quartz/events/Event.kt

@@ -107,6 +107,19 @@ open class Event(
         }
     }
 
+    override fun anyHashTag(onEach: (str: String) -> Boolean) = anyTagged("t", onEach)
+
+    private fun anyTagged(
+        tagName: String,
+        onEach: (str: String) -> Boolean,
+    ) = tags.any {
+        if (it.size > 1 && it[0] == tagName) {
+            onEach(it[1])
+        } else {
+            false
+        }
+    }
+
     override fun <R> mapTaggedEvent(map: (eventId: HexKey) -> R) = mapTagged("e", map)
 
     override fun <R> mapTaggedAddress(map: (address: String) -> R) = mapTagged("a", map)

quartz/src/main/java/com/vitorpamplona/quartz/events/EventInterface.kt

@@ -121,6 +121,8 @@ interface EventInterface {
 
     fun forEachHashTag(onEach: (eventId: HexKey) -> Unit)
 
+    fun anyHashTag(onEach: (str: String) -> Boolean): Boolean
+
     fun <R> mapTaggedEvent(map: (eventId: HexKey) -> R): List<R>
 
     fun <R> mapTaggedAddress(map: (address: String) -> R): List<R>