The rules index is extended to observe the segment path a rule belongs to.
An occurrence is bound to the rule that activated it and thus has an
associated segment path.
Rules to be picked for activation can be selected on the basis
of matched segment path.
Switch Dispatcher to use tag as Rule's unique identifier.
De-couple RuleMatcherImpl from the Rule instance.
Rule instances are externally provided, and in case of incremental
Program update these will be all replaced with new ones.
Better to keep loose coupling between those and the reactor implementation.
Breaking change: ReactorLifecycle to be used to initialize session
backend.
Remove deprecated stuff, deprecate some more.
Consolidate useless interfaces into bigger ones.
Extract interfaces for core classes, move implementation into "internal"
subpackage.
Fedor Isakov