AssetAPI::ParseAssetRef: Fix correctly resolving base path and filename for refs that dont have a file extension suffix. This is useful for Binary type requests to REST APIs eg. http://myservice.com/list/objects and you can also use URL query params now and it will be preserved as part of the 'filename'. For the transfer to be directed to the correct IAsset implementation you still need to have eg. .mesh suffix in your ref (this could be changed if EC_Mesh forces the mesh asset type to the request when it makes it, then suffix would not be needed).