addon for inheritance analysing and more (2nd merge trying)

.) add getter/setter generation
.) add inheritance in class model
.) add simpletype documentation on extended simpleType
-- example:
xs:simpleType name="StringLength0to256"
xs:restriction base="xs:string"
xs:minLength value="0"/
xs:maxLength value="256"/
/xs:restriction
/xs:simpleType
--> string
.) add basic class generation
.) add enumeration check and documentation generation
.) add choice check and documentation generation
.) add XSD-files location parameter in generator