Changes for the next major version

[NoahAndrews]

• Make sendRtrMessage() accept an expected response length, rather than an array of bytes

[LandryNorris]

The command to get elements from #35 should have a buffer field for elements. This will prevent having to write, read, and delete a file in order to get the data, and prevents multiple reads (to get the element metadata, you have to read the element anyways).

[NoahAndrews]

Honestly all DFU parsing functions would be better off in a separate library

[NoahAndrews]

initializeNotifier() should return a handle, and the other notifier functions should accept one.

[NoahAndrews]

We should remove the concept of registering a device to the HAL from node-can-bridge. That concept is useful in CANBridge, for allowing software written against WPILib to perform CAN communication using this library without having to change their code, but it is not useful here.

[NoahAndrews]

timeStamp should become timestampMs (or timestampUs if we end up using microseconds in CANBridge), and its type should be bigint