SMD Resistor Code

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Release version 1.5:
- Fix bugs.
- Add calculation function which allow users to add/subtract 2 Decimal/Binary/Octal/Hex numbers. Our algorithms will automatically accept to unsigned numbers, and regardless to their's base (Decimal/Binary/Octal/Hex). The result is signed number if it is negative. Users can convert to signed-magnitude, 1st complement, 2st complement number for negative number.