XSD import tool: support xs:any

[SimonCockx]

Example from the ISO 20022 schema:

	<xs:complexType name="SupplementaryDataEnvelope1">
		<xs:annotation>
			<xs:documentation>Technical component that contains the validated supplementary data information. This technical envelope allows to segregate the supplementary data information from any other information.</xs:documentation>
			<xs:appinfo>SupplementaryDataEnvelope1</xs:appinfo>
		</xs:annotation>
		<xs:sequence>
			<xs:any processContents="lax" namespace="##any"/>
		</xs:sequence>
	</xs:complexType>