Provide smarter output on the client, fixes #77

All events are directly forwarded to the client.  The client is now responsible for ordering them per project and displaying them if needed.  A thread is now started to read the terminal input with support for '+' to display one more line per project, '-' to display one line less, and 'Ctrl+L' to redraw the display which could become messed if the build messages are a bit unusual (this may require a better fix though).

common/pom.xml

@@ -51,6 +51,11 @@
             <artifactId>junit-jupiter</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>

common/src/main/java/org/jboss/fuse/mvnd/common/Message.java

@@ -146,9 +146,11 @@ public abstract class Message {
     }
 
     public static class BuildMessage extends Message {
+        final String projectId;
         final String message;
 
-        public BuildMessage(String message) {
+        public BuildMessage(String projectId, String message) {
+            this.projectId = projectId;
             this.message = message;
         }
 
@@ -156,6 +158,10 @@ public abstract class Message {
             return message;
         }
 
+        public String getProjectId() {
+            return projectId;
+        }
+
         @Override
         public String toString() {
             return "BuildMessage{" +
@@ -236,11 +242,13 @@ public abstract class Message {
         }
 
         private BuildMessage readBuildMessage(DataInputStream input) throws IOException {
+            String projectId = readUTF(input);
             String message = readUTF(input);
-            return new BuildMessage(message);
+            return new BuildMessage(projectId.isEmpty() ? null : projectId, message);
         }
 
         private void writeBuildMessage(DataOutputStream output, BuildMessage value) throws IOException {
+            writeUTF(output, value.projectId != null ? value.projectId : "");
             writeUTF(output, value.message);
         }