fix: warn if deprecated configs are used

[jeremylong]

For Ant and the CLI - warn if deprecated configuration settings are used. I would have done this for Maven also, but due to the use of "alias" it is more difficult.

[marcelstoer]

👍 If we expect the logging code to live longer, you could extract a helper function. The logging message follows a pattern (DRY).

As for Maven, we could check the MojoExecution configuration.

@Parameter(defaultValue = "${mojoExecution}", readonly = true)
private MojoExecution mojoExecution;

private void warnIfDeprecatedParamUsed(String deprecatedName, String currentName) {
    mojoExecution.getConfiguration()
        .getChildren()
        .stream()
        .filter(child -> deprecatedName.equals(child.getName()))
        .findFirst()
        .ifPresent(c -> getLog().warn("..."));
}

// invoke warnIfDeprecatedParamUsed() for each pair or maybe use reflection to find all aliased @Parameter annotation?

Or check the Maven session

@Parameter(defaultValue = "${session}", readonly = true)
private MavenSession session;

...
// session.getUserProperties() or session.getCurrentProject().getProperties()