Performs a linear interpolation between this vector and the given end vector, using the given scalar as a percent. iow, if changeAmnt is closer to 0, the result will be closer to the current value of this vector and if it is closer to 1, the result will be closer to the end value. The result is stored back in this vector.
@param endVec
@param scalar
@return this vector for chaining
@throws NullPointerException if endVec is null.
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