Wrap the EVE callback handler with a Rust friendly variant that allows
the user to register a callback as a closure which is provided an
already wrapped JsonBuilder object.
Ticket: #8477
There is an unfortunate side-affect that one has to read
output-eve-bindgen.h for the documentation on this type, however, I
think we can resolve that in time.
Moved devguide dir into userguide dir.
Since the devguide is now incorporated as the last chapter of the
userguide, removed build and configuration files from the devguide
dir, as these are no longer needed.
Task #4909