Allow POST to collections of complex and primitive types, and DELETE with $filter

1) POST of a single item to a collection of complex or primitive types adds that item to the collection (as it does today with entity types.). POST to an ordered collection adds to the end. ?$index can be used to insert other locations in an ordered collection 2) DELETE to any collection without a $filter clears the collection ODATA-616

https://www.oasis-open.org/apps/org/workgroup/odata/download.php/59028/odata-v4.01-wd01-part1-protocol.docx https://www.oasis-open.org/apps/org/workgroup/odata/download.php/59029/odata-v4.01-wd01-part2-url-conventions.docx https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/4.01%20spec/ABNF/odata-abnf-construction-rules.txt