SDL2 DCM

[VyrCossont]

Fixes #525.

TODO:

• [ ] Shut down correctly: look at SDL Quit event and cancellation token use in XInput DCM
• [ ] Test disconnection
• [ ] Test reconnection: is ID the same if a controller is disconnected and reconnected?
• [ ] Test correct behavior for non-rumbling controllers (ignore them)
• [ ] Test battery level
• [ ] Test with Xbone gamepad
• [ ] Test with Steam Controller
• [ ] Test with DualSense
• [ ] Test with Switch joycons
• [ ] Test with Switch single joycon
• [ ] Test with Switch Pro Controller
• [ ] Test with Wii U Pro Controller
• [ ] Test with Wiimote
• [ ] Test multiple controllers
• [ ] Repeat above on Windows
• [ ] Repeat above on Linux
• [ ] Stretch: repeat above on iOS
• [ ] I have no idea how to do this: repeat above on Android
• [ ] Test wired 360 controller (Windows)
• [ ] Test wireless 360 controller (Windows)
• [ ] Test wired 360 controller (Linux)
• [ ] Test wireless 360 controller (Linux)
• [ ] Test with an SDL game that uses a controller for input
• [ ] Test with a non-SDL game that uses a controller for input
• [ ] Stretch: New device type with 4 vibration actuators for Xbone/DualSense trigger vibration
• [ ] Stretch: New device type that is a controller without a battery sensor

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