Poco::Path constructors

[elemings]

Why does Poco::Path constructors only support `const char*' and `std::string' initialization? Why not `const wchar_t*' and `std::wstring' constructors? Or a `CharType' template constructor?

[guenter]

Because in POCO Unicode is generally handled by using UTF-8 encoded std::strings. This also applies to paths and other system identifiers. When interfacing the WIN32 API, POCO usually uses the Unicode APIs and transparently handles UTF-8 to UTF-16 conversion and vice versa. This has shown to be the best compromise with regards to cross-platform portability (compared to alternatives like using std::wstring, or, god forbid, yet another custom Unicode string class).