v4.2.0 (2025-10-14)

• Add arguments validation for schemas and validation methods (by validation contexts)
• Add SchemaSettings dataclass for storing read-only settings for schema instances
  and for managing package default settings
• Add block argument to XMLResource class (issue #464)
• Add MAX_SCHEMA_SOURCES package limit (1000, applied to XsdGlobals global maps instances)
• Add MAX_XML_ELEMENTS package limit (1,000,000, applied to non-lazy XMLResource instances)
• Reduce MAX_XML_DEPTH limit to 1000 and apply it to all XMLResource instances
• Fix for substitute match in case of unexpected child (issue #461)