[Change] `__APPLE__` for `_LIBCPP_HAS_NO_TIME_ZONE_DATABASE` to pass ……vcpkg triplkets *-osx

[Doc] Doxygen generated is updated to 1.11.0

[Change] Link `Iconv::Iconv` precisely.

[New] Test both BOMed UTF-16-LE & UTF-16-BE are ok to be converted to…… UTF-8

[Quirk] Simplify code a bit in hope to make MSVC 'fatal error C1001: ……Internal compiler error' go away

[Change] Sync `test/archlinux/aur_poc/` with `test/`

[Change] Sync `test/archlinux/aur_poc/` with `test/`

[Doc] Update `README.md`

[Change] Retain use of `std::forward<T>()` anywhere except Windows.

[Change] Replace `-g3 -Og` with `-O2` for more efficient library.