70_ONKYO_AVR.pm,71_ONKYO_AVR_ZONE.pm,ONKYOdb.pm: add setter for preset and balance
70_ONKYO_AVR.pm,71_ONKYO_AVR_ZONE.pm,ONKYOdb.pm: add setter for preset and balanceView Changes
Source: 70_ONKYO_AVR.pm,71_ONKYO_AVR_ZONE.pm,ONKYOdb.pm: add setter for preset and balance (https://sourceforge.net/p/fhem/code/11584/)