Remove dead Arrival Measurer feature and tracker JSPs

Both pieces of code were added January 2016 and have been untouched
since except for mechanical sweeps (package rename, Jakarta migration,
JSP layout conversion). Neither was ever linked from the webapp UI,
and the Arrival Measurer's MeasuredArrivalTimes table was write-only —
nothing in the codebase ever read it back.

Removed:
- testing/index.jsp ("Arrival Measurer") and its REST endpoint
  pushMeasuredArrivalTime in CommandsApi
- MeasuredArrivalTime entity, its unit test, and the round-trip case
  in EntityRoundTripTest
- MeasuredArrivalTime registration in AnnotatedClassesList
- tracker/{index,store}.jsp — an unrelated experimental
  smartphone-as-tracker page from the same era; store.jsp was
  particularly sketchy (unauthenticated endpoint that wrote
  attacker-controlled bytes to a hardcoded path)
- GenericQuery#doUpdate and its now-unused java.sql.Statement import —
  the only caller was the deleted endpoint
- A dangling "// WORK IN PROGRESS" comment that was sitting between
  the deleted method and cancelTrip

Existing deployments will have an orphaned MeasuredArrivalTimes table
that's no longer touched; operators should drop it with
"DROP TABLE MeasuredArrivalTimes;".

Author: aaronbrethorst

transitclock/src/main/java/org/transitclock/db/GenericQuery.java

@@ -23,7 +23,6 @@
 import java.sql.ResultSet;
 import java.sql.ResultSetMetaData;
 import java.sql.SQLException;
-import java.sql.Statement;
 import java.sql.Timestamp;
 import java.util.ArrayList;
 import java.util.List;
@@ -190,27 +189,6 @@ protected void doQuery(String sql, Object...parameters) throws SQLException {
 
 	}
 
-	/**
-	 * Executes an INSERT, UPDATE, or DELETE statement. 
-	 * 
-	 * @param sql The SQL to be executed
-	 * @throws SQLException
-	 */
-	public void doUpdate(String sql) throws SQLException {
-		Statement statement = null;
-
-		try {
-			statement = connection.createStatement();
-			statement.executeUpdate(sql);
-		} catch (SQLException e) {
-			throw e;
-		} finally {
-			if (statement != null)
-				statement.close();
-		}
-		
-	}
-	
 	/**
 	 * Returns number of rows read in.
 	 * 

transitclock/src/main/java/org/transitclock/db/hibernate/AnnotatedClassesList.java

@@ -33,7 +33,6 @@
 import org.transitclock.db.structs.Headway;
 import org.transitclock.db.structs.HoldingTime;
 import org.transitclock.db.structs.Match;
-import org.transitclock.db.structs.MeasuredArrivalTime;
 import org.transitclock.db.structs.MonitoringEvent;
 import org.transitclock.db.structs.Prediction;
 import org.transitclock.db.structs.PredictionAccuracy;
@@ -89,7 +88,6 @@ public class AnnotatedClassesList {
 		FareRule.class,
 		Frequency.class,
 		Match.class,
-		MeasuredArrivalTime.class,
 		MonitoringEvent.class,
 		PredictionAccuracy.class,
 		Route.class,