Threads are a bad idea because for now the filter API is not guaranteed
to be state-less. The interface is now synchronous, which should be
enough for most filters.
The refactoring brought other changes, the most important being the
concept of modular input sources and output destination and the complete
rewrite of the procedural macro.
The main goal of events/reports is to update a context object, which
will be used in filters to generate a response. It is now possible to
use any object implementing both Clone and Default as a context object.
It is also possible to define no context at all.
