Ability to poll raw controller input axis values

[w-utter]

Is your feature request related to a problem? Please describe.
In addition to being able to poll the Events with a given axis to return a normalized f64, this would allow the raw i32 input to be read (on linux at least).

Describe the solution you'd like
Adding an enum such as RawEvent that is in the raw dir, or similar.

Describe alternatives you've considered
An alternative is to remap the floats back into i32s, but the conversion back and forth makes the casting lossy