Add some more features to insert more game data and events into the big query tables

[gafferongames]

Trigger events on client with: next_client_event

Trigger events on server with: next_server_event

Stick in some optional data when the client upgrades, eg. matchmaking parameters like "time spent in matchmaking" would be a good start.

Ability to insert arrays of data values for client, and for server with timestamp (once per-10 secs...)