Everywhere: Remove klog(), dbg() and purge all LogStream usage :^)

Good-bye LogStream. Long live AK::Format!

Userland/Libraries/LibCore/DateTime.cpp

@@ -255,9 +255,4 @@ bool DateTime::is_before(const String& other) const
     return __builtin_strcasecmp(now_string.characters(), other.characters()) < 0;
 }
 
-const LogStream& operator<<(const LogStream& stream, const DateTime& value)
-{
-    return stream << value.to_string();
-}
-
 }