This release introduces key foundational features for the KML parser:

• GeometryType and RequiredElement enums to represent geometry types and required XML elements.
• KmlException, KmlParserException, and KmzExtractorException for more expressive and structured error handling.
• KmlValidator class to perform pre-validation of KML content before XML parsing.
• Integration of the validator into KmlParser::loadFromString().

These changes improve robustness and prepare the parser for more advanced validation and error reporting.