Raw Input plugin fails to process some negative values

Came from a UDN: [Link Removed]

Proposed fix is to change `FRawInputWindows::ParseInputData` to use this logic instead:

```
...

USHORT BitSize = ValueCapsBuffer[iValue].BitSize;
LONG SizeMask = (1 << BitSize) - 1;

int32 SignedValue = EachValue & SizeMask;

ULONG UMin = ValueCapsBuffer[iValue].LogicalMin & SizeMask;
ULONG UMax = ValueCapsBuffer[iValue].LogicalMax & SizeMask;
if (UMin > UMax)

DeviceEntry->AnalogData[iValue].Value = (float)SignedValue;

...
```

Some devices use both positive and negative values for the device, but the raw input code will clamp some values to be only positive.