[Feature Request] Get rid of faulty C-era functions

[elad335]

• [ ] All cstring's functions under String manipulation and String examination. All can be replaced with std::string_view and std::span which work with null terminator as well if needed. Thus are much better in performance as well due to not checking for null terminator. https://en.cppreference.com/w/cpp/header/cstring
• [x] std::exit, destructors of local variables are not called in any thread which may cause bugs.
• [ ] std::atexit, implementation must support atleast 32 functions. We do not want to collide with this limit sometime in the future. Static objects with destructor functions can be used instead.
• [ ] std::malloc, std::aligned_alloc, std::calloc, std::realloc, std::free. These functions are host to many UBs in c++. can be replaced with operator new.

This list may grow as I may add more functions in the future.

[elad335]

std::exit was removed 👍.

[Nekotekina]

I'd add locale-dependent functions such as isprint. Not urgent though.