- Rename `jupyter-received-message-types` to `jupyter-message-types` and add
message types for requests as well. Also change the keys to keywords instead
of symbols. Using plists with keywords is in line with `jupyter-messages` and
the arguments of the jupyter request functions.
- Rename `jupyter-request-run-callbacks` to `jupyter--run-callbacks`. This is
more of an internal function so mark it as such.
- Change the order of the first two arguments in `jupyter-add-callback` and
`jupyter-wait-until`. In both cases you are adding a callback to a request or
waiting for some condition to be satisfied on the request not on the message
type. This is also the reason why `jupyter-wait-until-received` keeps the
message type as the first argument. We are waiting until a message of a
certain type is received for a request, but the more important object in this
case is the message type.
- Update other files to take into account these changes.
