Add support for OData 4.01

[TrevorPilley]

To be implemented in feature-odata401

Things to do in order to implement this are:

ODataVersion

• Add OData401 property
• Update MaxVersion to return OData401

ODataServiceOptions

• Update SupportedFilterFunctions depending on the specified maxVersion

Metadata.XmlMetadataProvider

• Implement 4.01 changes
• Validate against the 4.01 XSD

Query.AllowedFunctions

• Add in function
• Add divby function

Query.ODataQueryOptions

• Add $compute query option

ODataQueryOptionsValidator40

• Refactor so it can be extended by the 401 validator

ODataQueryOptionsValidator401

• Implement

ODataQueryOptionsValidator

• Add ODataQueryOptionsValidator401 for ODataVersion.OData401