Stats Tester, Easy statistics

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1. New test: [One-sample proportion test] was added.
2. [t-test]: Calculation of Welch's p-value has been changed to direct from interpolation method.
3. [Mean and SD]: Kurtosis (α4: Normal distribution --> α4=3.0) was added.
4. A rare bug with [Share] button was fixed.
5. Updated help for some tests.
6. Notification became easier to read.