MPS-19628 Couldn't compute generation steps for model: check for invalid rules (with missing configs) and report them right away
Drop smodel.Trace which wasn't in use for quite some time now (nor was it possible to use it the way it was deemed to be used after certain refactorings).
Drop remote debug arguments from MPSLanucher configuration; use modern jdwp debug args.
Drop unused old code in generation plan
Refactor; simple MC by model grouping.
lang.constraints implement IConceptAspect from lang.structure, shall extend the language then
With errors reported after MPS-19628 fix, drop a rule to unknown language
MPS-19636 NullPointerException on closing project: the only chance for null module in MPSModuleTreeNode is generator node.
MPS-19610 generating build scripts from commandline fails. Bad skipChildren() in descendants iterator: skip for leaf node effectively skipped subtree of parent's siblings