move client from $ to _ meta

Author: jonesmac

sdk/src/androidTest/java/network/xyo/client/boundwitness/BoundWitnessTest.kt

@@ -79,7 +79,7 @@ class BoundWitnessTest {
             val bw = BoundWitnessBuilder().signer(Account.random()).payloads(listOf(
                 TestPayload1()
             )).build()
-            assert(bw.__client == "android")
+            assert(bw._client == "android")
             assert(bw.__signatures.size == 1)
         }
     }
@@ -92,7 +92,7 @@ class BoundWitnessTest {
             )).build()
             val serializedBw = JsonSerializable.toJson(bw)
             val bwJson = JSONObject(serializedBw)
-            assert(bwJson.get("\$client") == "android")
+            assert(bwJson.get("_client") == "android")
             assertNotNull(bwJson.get("\$signatures"))
         }
     }

sdk/src/main/java/network/xyo/client/boundwitness/BoundWitness.kt

@@ -7,8 +7,7 @@ import network.xyo.client.boundwitness.model.BoundWitnessMeta
 @JsonClass(generateAdapter = true)
 open class BoundWitness(client: String? = "android", signatures: List<String> = emptyList()) : BoundWitnessMeta,
     BoundWitnessFields() {
-    @Json(name = "\$client")
-    final override var __client: String? = client
+    final override var _client: String? = client
 
     @Json(name = "\$signatures")
     final override var __signatures = signatures

sdk/src/main/java/network/xyo/client/boundwitness/model/BoundWitnessMeta.kt

@@ -3,6 +3,6 @@ package network.xyo.client.boundwitness.model
 import java.io.Serializable
 
 interface BoundWitnessMeta: Serializable {
-    var __client: String?
+    var _client: String?
     var __signatures: List<String>
 }