Replace the six typed addNewXxxFilter factories with a single generic
addNewFilter<T>(init) template. The combined filter no longer references
any concrete RimCellFilter subclass; callers supply the type and an init
lambda for type-specific configuration, while the combined filter handles
cycle checks, parent-case propagation, signal wiring, and host notification.
Addresses PR #13911 review feedback.
Kristian Bendiksen
5989785daf