The previous project architecture was far too complicated and hard to
maintain. The new one is much more simple. Although procedural macros
are cools, they are a no-go on Rust-OpenSMTPD.
Reports and filter are implemented (except data-line) but untested.
The construction of an EventHandler object should not be directly done
by the client. Instead, it is easier to use procedural macro to
automatize the process, hence exposing a nice and simple interface. Such
use of procedural macros requires to crate an additional crate.
The latest OpenSMTPD draft added the timeout event, it therefore has
been added to the parser. As shown in the new sessions examples, the
timestamp format changed and the parameters are also optional.
