Add setThresholds() and variables to hold the thresholds #47
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…original fixed thresholds.
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This change is in response to issue #49.
I added new function setThresholds() to set thresholds, and added new threshold variables and initialized them to the original fixed thresholds.
I needed this change because the fixed Z_THRESHOLD value was about 3X too big for my touchscreen. Rather than edit the value of Z_THRESHOLD in the XPT2036_Touchscreen.cpp file, I figure it is better in the long run to add a function to allow the user to set the thresholds.
If you are not accepting pull requests, I'll clone this library and release it under a modified name, if that is okay with you.