+ LV2: declare data-access/instance-access as optional features
+ LV2: declare data-access/instance-access as optional features

adiknoth/calf,adiknoth/calf,zamaudio/calf-LR4,adiknoth/calf,jnetterf/calf,zamaudio/calf-LR4,jnetterf/calf,zamaudio/calf-LR4,zamaudio/calf-LR4,zamaudio/calf-LR4,jnetterf/calf,jnetterf/calf,adiknoth/calf,adiknoth/calf,jnetterf/calf