Refactor ide.callgraph slightly.
Refactor ide.callgraph slightly.

Makes more sense to build the call graph in one step and for get()
to be responsible for collecting the trace.

Sable/mclab-ide,Sable/mclab-ide,Sable/mclab-ide,Sable/mclab-ide,Sable/mclab-ide,Sable/mclab-ide