Suboptimal string operations #96
Description
There is a lot of suboptimal string operations all over the place
- numerous formats without proper buffering leading to tons of temporary allocations, some small some large
- lot of pointers to strings which do not hold size, leading to numerous unnecessary std::strlen ops in different places where it could be avoided
- stringstream use with bunch of std::endl causing flushes (should probably be replaced by fmt::format overall with proper buffering for better performance and std::endl replaced with simple newline)