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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