Add possibility to use multidimensional trace addon with RTDs specified in a separate file

It seems that it is not currently possible to use the multidimensional trace addon with RTDs specified in a separate file of the static model.

To use this addon with my execution engine, I specify my RTDs in a separate file of the static model (no weaving is used). The view of the multidimensional trace addon is built when the first step is executed but then the view is not updated on the following step executions. The addon does not see that the RTDs have been updated.

In the file org.eclipse.gemoc.trace.gemoc/src/org/eclipse/gemoc/trace/gemoc/traceaddon/AbstractTraceAddon.xtend, the BatchModelChangeListener is built with the resource model to execute (the static model) and all resources related to it (i.e., resources that are linked to the resource model with cross references). To be a bit more generic, it may be interesting to built the BatchModelChangeListener with the resource that contains the RTDs, which may be the resource model (in case of weaving) or another file (if RTDs are specified in a separate file).