ignore touch event if it does not originate from this joystick instance #36
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As described in #32, in cse of multiple joysticks, releasing on joystick triggers onTouchEnd to all joysticks.
Using the changes in this PR, the joystick keeps the last touch event coordinates and accepts the onTouchEnd event only if the final touch coordinates deviate at most 10px.
I used this change in one of my projects and it works. I am nor really source about edge cased, but it remained to be examined.