🦟 Bug fix

Part of gazebosim/sdformat#790

(See section (2) of gazebosim/sdformat#790 (comment))

Summary

The output stream would change the value when calling precision(). This causes issues changing the precision of the output stream.

For example,

math::Vector3d test(1.5707963267948966, 0, 0);
std::cout << test;
// prints 1.5708 0 0

std::cout << std::setprecision(std::numeric_limits<double>::digits10) 
              << test; 
// prints 1.5707960000000001 0 0; x should be 1.5707963267949

Since there doesn't seem to be a clear reason to why the value is changed and the default precision is already 6, I've deprecated the function that changes the value appendToStream(std::ostream &_out, T _number, int _precision) to be replaced with appendToStream(std::ostream &_out, T _number).

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
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• All tests passed (See test coverage)
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