Use maps for JSON output.

briar-headless/src/main/java/org/briarproject/bramble/identity/OutputAuthor.kt

@@ -1,21 +1,13 @@
 package org.briarproject.bramble.identity
 
 import org.briarproject.bramble.api.identity.Author
-import javax.annotation.concurrent.Immutable
 
-@Immutable
-data class OutputAuthor(
-    val id: ByteArray,
-    val name: String,
-    val publicKey: ByteArray
-) {
-    constructor(author: Author) : this(
-        id = author.id.bytes,
-        name = author.name,
-        publicKey = author.publicKey
-    )
-}
-
-fun Author.output() = OutputAuthor(this)
+fun Author.output() = mapOf(
+    "formatVersion" to formatVersion,
+    "id" to id.bytes,
+    "name" to name,
+    "publicKey" to publicKey
+)
 
 fun Author.Status.output() = name.toLowerCase()
+