The dispatcher of all updates
This class dispatches all kinds of updates to its registered handlers.
Dispatcher(bot) is.Dispatcher(x)
| bot | The bot object that should be passed to the handlers. | 
| x | Object to be tested. | 
An R6Class object.
add_handlerRegisters a handler in the
Dispatcher.
add_error_handlerRegisters an error handler in the
Dispatcher.
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