We have a liquibase command that looks something like this:

```sh
/liquibase/liquibase \
       --driver=org.postgresql.Driver \
       --changeLogFile="db.changelog-master.xml" \
       --url=<redacted> \
       --username=<redacted> \
       --password=<redacted> \
       update \
       -Dcoreschema="${core_schema}"
```

After upgrading the CLI from 4.3.3 to 4.4.0, it fails with the following error:

```
Unexpected argument(s): -Dcoreschema=public

For detailed help, try 'liquibase --help' or 'liquibase <command-name> --help'
```

Since the release notes state "this release should be 100% backwards compatible", I expect this is an oversight? Or is there a replacement for the `-Dproperty=value` syntax? I haven't found one looking through `--help` and the [property substitution docs](https://docs.liquibase.com/concepts/basic/changelog-property-substitution.html) at least.

The syntax can also still be found on https://docs.liquibase.com/tools-integrations/cli/home.html:

![image](https://user-images.githubusercontent.com/2620907/122090597-36d63400-ce08-11eb-92e8-d320cd5c5baa.png)


private Map<String, Object> configureResourceAccessor(ClassLoader classLoader) {
        Map<String, Object> returnMap = new HashMap<>();
        returnMap.put(Scope.Attr.resourceAccessor.name(), new CompositeResourceAccessor(new FileSystemResourceAccessor(Paths.get(".").toAbsolutePath().toFile()), new CommandLineResourceAccessor(classLoader)));
        return returnMap;
    }
    protected ClassLoader configureClassLoader() throws IllegalArgumentException {
        final String classpath = LiquibaseCommandLineConfiguration.CLASSPATH.getCurrentValue();
        final List<URL> urls = new ArrayList<>();
        if (classpath != null) {
            String[] classpathSoFar;
            if (isWindows()) {
                classpathSoFar = classpath.split(";");
            } else {
                classpathSoFar = classpath.split(":");
            }
            for (String classpathEntry : classpathSoFar) {
                File classPathFile = new File(classpathEntry);
                if (!classPathFile.exists()) {
                    throw new IllegalArgumentException(classPathFile.getAbsolutePath() + " does.not.exist");
                }
                try {
                    URL newUrl = new File(classpathEntry).toURI().toURL();
                    Scope.getCurrentScope().getLog(getClass()).fine(newUrl.toExternalForm() + " added to class loader");
                    urls.add(newUrl);
                } catch (MalformedURLException e) {
                    throw new IllegalArgumentException(e);
                }
            }
        }
        final ClassLoader classLoader;