Corrected Segmentation fault in read(const char*)
Added support for unicode escaping with char type.
Added support for '/' escaping that json allows for some reason.
Added [[noreturn]]
Deleted some useless code that caused warnings
Corrected bug in hash_map<> copy.

_table was copied using its copy constructor, but no new memory was
allocated whereas hash_map<>::clear tried to deallocate it in both
original object and the copy.
This fix the bug in "src/bugs/bug_hmap_mem_corrupt.cpp".