Win32: avoid symbol lookup if UNICODE is defined
Merge pull request #304 from funman/master

Win32: avoid symbol lookup if UNICODE is defined
Rewrote ByteVector::replace() simpler
Merge pull request #309 from TsudaKageyu/fix-replace

Rewrote ByteVector::replace() simpler (fix for the issue #308)
Replaced wrongly used slashes with backslashes in some comments
Merge pull request #310 from TsudaKageyu/backslash

Replaced wrongly used slashes with backslashes in some comments