Cap gamepad axis range

[KoltesDigital]

Otherwise it wraps to 0 when axis is 1.

[fand]

thx for PR!
I didn't know that 256 is wrapped to 0 in Uint8Array😫

hmm, Math.min(axis * 128 + 128, 255); works well, but it's kind of hack.
It looks that UnsignedByteType is not suitable for representing axis data...
We should replace it with float texture because Gamepad API returns float values:
https://developer.mozilla.org/en-US/docs/Web/API/Gamepad/axes

It's a breaking change but is reasonable, IMO

[KoltesDigital]

Oh come on, your code tells you're an excellent coder!

I thought it was on purpose, because with floats it'll take four times the space in memory. 256 values is good enough for gamepad values.

[fand]

Currently the DataTexture takes 256 bytes (=256 * 1byte)
If we choodse float texture and use Float32Array, the array takes only 1KB (= 128 * 2 * 4bytes).
This difference is ignorable in modern PC.

[KoltesDigital]

Superseded by #24 .