sqlite3官方扩展extension-function在windows下的编译和用法。
在sqlite3标准语法的基础上扩充了：
Math: acos, asin, atan, atn2, atan2, acosh, asinh, atanh, difference,
degrees, radians, cos, sin, tan, cot, cosh, sinh, tanh, coth, exp,
log, log10, power, sign, sqrt, square, ceil, f
