Increase deadzone default to 20%, this is normal for gamepad style controllers
DO NOT square the incoming deadzone value!!! Player asked for 10% or 20% don't turn it into 1%!!!
Do not multiply the input values by 2 on use.
Normalise the remaining range from deadzone to full value into 0<>1 range.
Clamp the deadzone to a reasonable range.
Merge pull request #3236 from fluffyfreak/deadzone

Deadzone