Support changing heating, warm water modes

- write int command 3002, write int ID, write int value
- flush
- read int command, read value
- ID_Param.ID_Ba_Hz_akt
- ID_Ba_Bw_akt
- Strings: "Automatik", "Party", "Ferien", "Zweit_Warmeerz", "Aus"
- Values: 0, 2, 3, 1, 4