Done many things...

Done many things...

- typedefs for wide chars.
- STRUCT and ENUM pre-declare macros.
- winapi_get_current_working_directory().
- Arena.buff_size's type: size_t -> uint64.
- Arena_make(buff_size) takes buff_size as argument.
- Arena_reset() which sets the ptr to buff.
- Arena_alloc_str() macro which allocs a str printed using snprintf
and returns the string
- new Category "String".
- cstr_to_wstr().
- new Category "Args".
- shift_args().
- Arena_alloc() reallocs buff if buff cannot hold new size.