PCD8544 - attempts to fix module running into strange js behavior

Ok, that's now fixed in GitHub. This also explains the problems people were having with resetting the displays. I'm still not sure why I never had this issue myself :)

Just a note about uint8arrays:

>var a = new ArrayBuffer(10)
>b = new Uint8Array(a)
=[object Uint8Array]{
0: 0,
1: 0,
2: 0,
3: 0,
4: 0,
5: 0,
6: 0,
7: 0,
8: 0,
9: 0
}
>for (i in b) b[i]=i;
> c = new Uint8Array(b,5,5)
= [object Uint8Array]{
0: 0,
1: 1,
2: 2,
3: 3,
4: 4,
5: 5,
6: 6,
7: 7,
8: 8,
9: 9
}
> c = new Uint8Array(a,5,5)
= [object Uint8Array]{
0: 5,
1: 6,
2: 7,
3: 8,
4: 9
}

It's a bit crazy really.

Graphics in Espruino uses ArrayBuffer, not Uint8Array, so actually in this case it's behaving perfectly - the only issue is that it doesn't error out when you give it range that extends past the end of the array - that that's actually pretty useful :)