Improvements to icecast failure handling (#1401)

- Add mechanism to persist failure reason while continuing to reconnect
- Add 'warning' attribute for failure conditions that may be temporary,
  but still need to be reported
- Add logging for failures
- Prevent possibly temporary server-side conditions from blocking
  reconnect attempts
- Detect icecast 2.4 auth failures
- Prevent generic errors from overriding existing error state

src/main/java/io/github/dsheirer/gui/playlist/streaming/StreamingEditor.java

@@ -440,7 +440,10 @@ public class StreamingEditor extends SplitPane
             TableColumn stateColumn = new TableColumn("Stream Status");
             stateColumn.setCellValueFactory(new PropertyValueFactory<>("broadcastState"));
 
-            mConfiguredBroadcastTableView.getColumns().addAll(enabledColumn, nameColumn, typeColumn, stateColumn);
+            TableColumn errorColumn = new TableColumn("Last Error");
+            errorColumn.setCellValueFactory(new PropertyValueFactory<>("lastBadBroadcastState"));
+
+            mConfiguredBroadcastTableView.getColumns().addAll(enabledColumn, nameColumn, typeColumn, stateColumn, errorColumn);
 
             mConfiguredBroadcastTableView.getSelectionModel().selectedItemProperty()
                     .addListener((observable, oldValue, newValue) -> setBroadcastConfiguration(newValue));