Control for autocenter controlled by wheel

[albfan]

This switch is a feature for thrustmaster devices

fixes #262

[albfan]

This might hide switch for non thrustmaster devices

I added some checks when device is disconnected, but probably all parameters should be disabled and reset if device is disconnected, right now it allows to change values (even without device)

[berarma]

I'm still not sure what this switch does. When it's enabled, it allows to change the autocenter force, and when it's not? It has to do something else to be useful. And the tooltip should explain it.

[albfan]

autocenter controls the force applied
enable_autocenter controls if that force is applied or not

enable_autocenter:y
autocenter: 0

is same as:

enable_autocenter:n
autocenter:65535 (or any other value)

You can expect any other thrustmaster wheel to support the same

[berarma]

I guess that the setting in the Windows Thrustmaster panel will prevent games from changing autocenter when that setting is set to "by the wheel". Is this switch doing the same or it's just another way of setting autocenter to zero?