Free engineering calculator 991 es plus & 92

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# 4.0.4
Fixed some bugs and stability improvement.

About this update:
- Added scroller for unit conversion result display
- Fixed bug when copy and paste
- Single line toolbar
- Unit conversion shortcut
- Update math library: Gather, GatherBy, InverseCDF, Quiet, RandomPrime, ReplaceRepeated, SortBy, BellY, ChebyshevT, ChebyshevU, Coefficient CoefficientList, Cyclotomic, Exponent, HermiteH, LaguerreL, LegendreP, LegendreQ.
- Fixed cannot import text file in programming editor.