objlist/funclist: remove fnptr

[malachib]

Things like:

• objlist_function_factory
• funclist

Need provision not just to add a fnptr but also to remove one. This is a non trivial operation, but is probably possible via some clever (and hopefully not too complicated) signaling of consumers along with a kind of objlist compaction operation.

Task requirement only needs objlist-oriented flavor. Other memory management techniques outside scope of this task.