[w3c/gamepad] Terminology of inputs. (#131)

Currently it's suggested that the inputs are either "button" or "axis". I find this too wide.

I suggest the following:

**button**: "input's with state either 0 or 1, default 0"
**toggle**: "input's with state either 0 or 1, no default" <--- **not** part of "standard gamepad"
**trigger**: "input's with state range from 0 to 1, default 0"
**spring**: "input's with state range from 1 to 0, default 1" <--- **not** part of "standard gamepad"
**dpad**: "input's with 4 states; up, down, left, right. default 0"
**joystick**: "input's with two axis with state range from 0 to 1, default NaN"
**menu**: "input's with state either 0 or 1, default 0. placement in menu cluster"

**left** cluster: "input's that are reachable for the left hand"
**right** cluster: "input's that are reachable for the right hand"
**menu** cluster: "input's that are reachable with both left and right hand with only a small movement"

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