Clarify that 'parameter' aliases can also be used to substitute expressions

Query parameters for $filter segment are always passed in as expressions (because that is the expected type of the parameter). All other parameters defined as query options are evaluated in the context of the resource identified by the URL path segment in which they are used and passed as literals into the expression. Add ability to assign values to parameter aliases within $expand, in which case they are evaluated relative to the resource context of the $expand. Also consider adding to $select when considering ODATA-1105 .

https://www.oasis-open.org/committees/download.php/61628/odata-v4.01-wd03-part1-protocol-2017-09-22.docx https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/4.01%20spec/ABNF/odata-abnf-construction-rules.txt?op=diff&rev=1089 https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/4.01%20spec/ABNF/odata-abnf-testcases.xml?op=diff&rev=1089