GNN and DGL support, Merge after CNNArch2Gluon
Merge GNNs, DGL support (CNNArchLang -> CNNArch2X -> CNNArch2Gluon -> EMADL2CPP, maven-streamtest -> emadl-maven-plugin)
Edited by Nils Baumann
Merge GNNs, DGL support (CNNArchLang -> CNNArch2X -> CNNArch2Gluon -> EMADL2CPP, maven-streamtest -> emadl-maven-plugin)