Log class has the Stream class as a base class now

- implemented some missing operators<<(...)
- removed Manipulators: l1, l2, l3, l4, lend, lsave
- PascalCase to snake_case in Log

added to Stream:
  virtual bool is_char_stream() const = 0;
  virtual bool is_wchar_stream() const = 0;
  virtual char get_char(size_t index) const = 0;
  virtual wchar_t get_wchar(size_t index) const = 0;
  virtual Stream & operator<<(const Stream & stream) = 0;

src/utf8/utf8.cpp

@@ -291,6 +291,46 @@ return len;
 }
 
 
+// new function, need to be tested a little more especially when sizeof(wchar_t) is 2
+size_t utf8_to_int(const Stream & utf8, size_t stream_index, int & res, bool & correct)
+{
+size_t i, len;
+unsigned char uz;
+
+	res = 0;
+	correct = false;
+	len = 0;
+
+	if( stream_index < utf8.size() )
+	{
+		uz = utf8.get_char(stream_index);
+
+		if( !private_namespace::utf8_to_int_first_octet(uz, len, res) )
+			return 1;
+
+		if( stream_index + len < utf8.size() + 1 )
+		{
+			for(i=1 ; i<len ; ++i)
+			{
+				uz = utf8.get_char(stream_index + i);
+
+				if( !private_namespace::utf8_to_int_add_next_octet(uz, res) )
+					return i;
+			}
+
+			if( utf8_check_range(res, len) )
+				correct = true;
+		}
+		else
+		{
+			len = utf8.size() - stream_index;
+		}
+	}
+
+	return len;
+}
+
+
 
 
 /*