steam: removed the one second wait before sending poll requests

Aside from this being completely pointless, it adds on more latency to
poll replies. The Steam API already has the poll requests wait, which is
defined in the steam-api.

Overall, this should preform better in terms of latency as well as
efficiency.
Retrieve and store the session id upon authenticating

The session id, also known as a webcookie, is the authenticated value
needed to make calls to the Steam Community API. This will be used for
adding and removing friends.

This will require all accounts to reauthenticate.