interpret some escape sequences in cli lexer

alib2cli/src/lexer/Lexer.cpp

@@ -201,7 +201,16 @@ q5:	if ( m_index >= m_line.size ( ) ) {
 		return res;
 	}
-	res.m_value += m_line [ m_index ];
+	if ( m_line [ m_index ] == 'n' ) {
+		res.m_value += '\n';
+	} else if ( m_line [ m_index ] == 't' ) {
+		res.m_value += '\t';
+	} else if ( m_line [ m_index ] == '"' ) {
+		res.m_value += '"';
+	} else {
+		res.m_value += m_line [ m_index ];
+	}
+
 	m_index++;
 	goto q4;
 }