Refactor: IPerformanceTracer globally available from the session context
Refactor: two-step delta processing; less cryptic conditions for generation sequence aspects
Do not drop input name(mapping label) when consequence with parameters in invoked.
Merge remote-tracking branch 'origin/master' into 3.1/artem/default
Revert recent GeneratorUtil changes partially: new input node shall not be part of the outer context prior all parameter queries are evaluated. Otherwise, macros that update input node (e.g. switch or call) get wrong value for a parameter that utilizes inputNode.