+ Framework: remove dependencies of dssigui.cpp on plugin classes
+ Framework: remove dependencies of dssigui.cpp on plugin classes

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