Migrated everything except

- the Bytes utilities class - it's easier to do in Java as with Kotlin byte + byte = int
- the demo project, which I'm not sure I'll migrate. Maybe I'll make a new Kotlin Demo application

demo/src/main/java/ch/dissem/bitmessage/demo/Main.java

@@ -81,8 +81,8 @@ public class Main {
                 }
 
                 @Override
-                public void offerAddresses(List<NetworkAddress> addresses) {
-                    LOG.info("Local node registry ignored offered addresses: " + addresses);
+                public void offerAddresses(List<NetworkAddress> nodes) {
+                    LOG.info("Local node registry ignored offered addresses: " + nodes);
                 }
             });
         } else {

demo/src/test/java/ch/dissem/bitmessage/TestListener.kt

@@ -14,29 +14,28 @@
  * limitations under the License.
  */
 
-package ch.dissem.bitmessage;
+package ch.dissem.bitmessage
 
-import ch.dissem.bitmessage.entity.Plaintext;
+import ch.dissem.bitmessage.entity.Plaintext
 
-import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.TimeUnit;
+import java.util.concurrent.CompletableFuture
+import java.util.concurrent.TimeUnit
 
 /**
- * Created by chrig on 02.02.2016.
+ * Test listener that allows you to wait for a message in tests.
  */
-public class TestListener implements BitmessageContext.Listener {
-    private CompletableFuture<Plaintext> future = new CompletableFuture<>();
+class TestListener : BitmessageContext.Listener {
+    private var future = CompletableFuture<Plaintext>()
 
-    @Override
-    public void receive(Plaintext plaintext) {
-        future.complete(plaintext);
+    override fun receive(plaintext: Plaintext) {
+        future.complete(plaintext)
     }
 
-    public void reset() {
-        future = new CompletableFuture<>();
+    fun reset() {
+        future = CompletableFuture<Plaintext>()
     }
 
-    public Plaintext get(long timeout, TimeUnit unit) throws Exception {
-        return future.get(timeout, unit);
+    operator fun get(timeout: Long, unit: TimeUnit): Plaintext {
+        return future.get(timeout, unit)
     }
 }

demo/src/test/java/ch/dissem/bitmessage/TestNodeRegistry.java

@@ -50,7 +50,7 @@ class TestNodeRegistry implements NodeRegistry {
     }
 
     @Override
-    public void offerAddresses(List<NetworkAddress> addresses) {
+    public void offerAddresses(List<NetworkAddress> nodes) {
         // Ignore
     }
 }