This commit increase warning level from `W3` to `W4` on MSVC and sets
warnings as errors. Exclusion is made for a specific warning (C4189).

* Use "nullptr" instead of "NULL"

* Cosmetic fix

* bind2nd() and ptr_fun<>() is removed since C++17

bind2nd() and ptr_fun<>() are deprecated in C++11, and removed in C++17.
These functions are not available in LLVM's "libc++".
Use C++11 lambda expressions for them.

* Break long lines

* Add missing header for std::iswspace()

* Fix warning about the array delete

* Fix ErrorCode enum

* Fixing unintalized vars

* Fix warnings pertaining to EncodingType.

* More fixes to enum related warnings

* Enable warnings

* Work without "-fpermissive" option

* Cosmetic fix

* Add "const" to fix warnings

These strings are not needs to modify.

* No need to use "#pragma once" in main C++ source file

* Cosmetic fix

Add newline to end

* Return nullptr if error

* delete() not works for "void*"

Cast specific type to use delete()

* Disable VC++ specific pragmas for other C++ compilers

* Fix warning

* Fix warning

* Use pipeline for compiler

* Enable code optimization

* Add "default:" to fix "switch" syntax warning

* Use "nullptr" for null pointer

* Use nullptr instead of NULL

* Use nullptr instead of NULL

* Use "L" notation for wide character

* Use C++ header instead of raw C header