v0.5.0

Thanks to @JSensebe for his contributions!

Changed

• BREAKING: Rename SensorInterface to SensorDriver.
• BREAKING: Rename GeneratorSensorInterface to IterableSensorDriver
  and some accompanying type aliases.
• BREAKING: Decouple SensorDriver and InputDriver so that
  the former is no longer part of the latter.
• Use InputDriver.max_users to filter sensor input
  regardless of the underlying sensor driver.

Added

• Add SensorDriver.poll.
• Add SessionBuilder.with_sensor.
• Add Session.set_controller_port_device.

Fixed

• Improved documentation for IterableSensorDriver.
• Fix a GET_VARIABLE dereference error.