Add meta option to OSM query

Add a boolean 'meta' optional arg to query_osm. This will additionally query
all the OSM meta information, including user, uid, changeset, version and
timestamp. If included, the timestamp is converted to a datetime64
Fix bug in bd3ed0e04e

Need to include the wayid and relid in each of the waynodes and
relmembers.
BUG: Fix reference to osmdata structure

Use the distributed variables instead.
Refactor render function to be a little cleaner

Separate out the logical blocks to individual functions.
Fix meta data reading for ways/relations.
Refactor the XML reading function

To make it a little easier to read