This reverts commit 2b5c12f3.

* use std::memcpy in class Replay

* remove pointer casting

* check sizeof(wchar_t)

* EncodeUTF8: use unsigned operand

* DecodeUTF8: use unsigned operand

* EncodeUTF8: check array size

* DecodeUTF8: check array size

* replace sprintf with snprintf

* zero initialize

* remove outdated macro

* remove outdated macro in clzma