Introduced pseudo nodes for ASTs and CFGs to speedup queries. In the past, AST and CFG nodes were directly connected to the function node, requiring links to be filtered to access AST or CFG nodes only. Now, all AST nodes and CFG nodes are connected to a respective pseudo node and the function is only connected to the pseudo nodes.
Fixed a bug in the 'basicBlock'-steps in joernsteps.groovy, which surfaced when introducing the callgraph.