Add streamdeckplus support

[admiral0]

I cleaned up @karstlok 's pull request ( #108) to add support for the streamdeck+. Differences:

• Refactored _read_keyl_states into _read_control_states
• Renamed rotary to dial. It just felt wrong to me. ¯\_(ツ)_/¯
• added new functions to check on device capabilities
• used Enums for event types and control types
• moved streamdeckplus specific code to its own file
• reworked API interfaces on callbacks

# no change
def callback_key(deck_instance, key_index, key_state_bool):
  pass
# changed
def callback_dial(deck_instance, dial_index, event_type: DialEventType, value):
  pass
# changed
def callback_touchscreen(deck_instance, event_type: TouchscreenEventType, value: dict):
  pass

[benedikt-bartscher]

Hi @admiral0 i just tested this PR with src/example_plus.py and as far as i can tell everything works fine. Thank you very much!

[abcminiuser]

Thanks! I meant to get to this sooner, but I've merged a slightly tweaked version of this in 56f91960297f753acdaeb79fd460c4326f7c4840.

Unfortunately the StreamDeck + is damned expensive in Australia (and I can't justify the expense for a hobby project) and Corsair told me to shove it when I asked for even temporary access to a unit, so I'm trusting on you and the rest of the community to verify that it works before I tag off the next version for PyPi.

Can you please grab the latest master and verify the example script works on the StreamDeck +?

[admiral0]

I cannot test it for two weeks - traveling atm. Maybe @benedikt-bartscher or @joelspiers15 can.

[karstlok]

Just tested it, works.

[benedikt-bartscher]

Thanks @abcminiuser, i just tested the master branch, however the icons on the touchscreen are broken for me. They work fine in this MR. I will try to debug further later this evening.

[benedikt-bartscher]

I fixed those issues in https://github.com/abcminiuser/python-elgato-streamdeck/pull/129

[joelspiers15]

Also was seeing that same touchscreen image drawing issue, #129 fixed it.