Add string to bool converter

[codein-dev]

falcon/src/to_any_converter.cpp

Line 50 in 53ed499

toAnyConverter<int>([](const std::string& s) {

[codein-dev]

We don't yet have string to bool converter but yes/no or true/false kind of data is very common. The following strings should be converted to true.

• YES, yes, Yes, Y, y, 1, true, t

And following values should be converted to false.

• NO, no, No, N, n, 0, false, f