store a PluginManager rather than a MarbleModel internally
store a PluginManager rather than a MarbleModel internally

tzapzoor/marble,David-Gil/marble-dev,rku/marble,David-Gil/marble-dev,tucnak/marble,oberluz/marble,tzapzoor/marble,probonopd/marble,adraghici/marble,utkuaydin/marble,tzapzoor/marble,quannt24/marble,Earthwings/marble,tucnak/marble,quannt24/marble,rku/marble,rku/marble,tucnak/marble,tzapzoor/marble,probonopd/marble,oberluz/marble,utkuaydin/marble,rku/marble,utkuaydin/marble,adraghici/marble,oberluz/marble,utkuaydin/marble,quannt24/marble,oberluz/marble,probonopd/marble,probonopd/marble,AndreiDuma/marble,adraghici/marble,utkuaydin/marble,adraghici/marble,AndreiDuma/marble,AndreiDuma/marble,tzapzoor/marble,probonopd/marble,Earthwings/marble,David-Gil/marble-dev,adraghici/marble,Earthwings/marble,oberluz/marble,quannt24/marble,David-Gil/marble-dev,probonopd/marble,David-Gil/marble-dev,AndreiDuma/marble,tucnak/marble,tucnak/marble,tzapzoor/marble,tucnak/marble,AndreiDuma/marble,rku/marble,tzapzoor/marble,quannt24/marble,tzapzoor/marble,Earthwings/marble,rku/marble,adraghici/marble,quannt24/marble,utkuaydin/marble,Earthwings/marble,Earthwings/marble,probonopd/marble,AndreiDuma/marble,David-Gil/marble-dev,tucnak/marble,quannt24/marble,oberluz/marble