Moved most of the message handling to other classes.

I'm finding that this code is being used multiple times, so inheritance seems to be warranted.

interface/build.gradle

@@ -24,6 +24,7 @@ dependencies {
     implementation 'com.googlecode.soundlibs:jlayer:1.0.1.4'
     implementation 'com.mpatric:mp3agic:0.9.1'
     implementation project(":libwave")
+    implementation project(":browserCommands")
 
     // Declare the dependency for your favourite test framework you want to use in your tests.
     // TestNG is also supported by the Gradle Test task. Just change the