Project updater improvements

[etatara]

The Repast nature on an Eclipse project provides several update functions. One updates the nature with new build and library dependencies, while a second action updates the model installer scripts and associated launch configs. We might want to also provide an update on the model run launch configs since the VM args we provide as default in new projects can change over time. We might also want to unify the update into a single action instead of multiple separate update actions as is currently.