src/main/java/org/imsglobal/lti/BasicLTIUtil.java
public static Properties cleanupProperties(final Properties rawProperties) {
        final Map<String, String> map = cleanupProperties(
                convertToMap(rawProperties), null);
        return convertToProperties(map);
    }
public static Properties cleanupProperties(final Properties rawProperties) {
        final Map<String, String> map = cleanupProperties(
                convertToMap(rawProperties), null);
        return convertToProperties(map);
    }
Any properties which are not well known (i.e. in
{@link BasicLTIConstants#validPropertyNames}) will be mapped to custom
properties per the specified semantics.

@deprecated See {@link #cleanupProperties(Map)}
@param rawProperties A set of {@link Properties} that will be cleaned.
Keys must be of type {@link String}.
@return A cleansed version of {@link Properties}.