With the recent packet manager work, it broke to register a protocol
analyzer for a specific port from inside a plugin's initialization code.
That's because that registration now depends on the packet manager being
set up, which isn't case at that time a plugin's `InitPostInit()` runs.
This fix contains two parts:
- Initialize the packet manager before the analyzer manager, so that
the latter's `InitPostScript()` can rely on the former being
ready.
- Change the analyzer manager to (only) record port registrations
happening before it's fully initialized. Its `InitPostScript()`
then performs the actual registrations, knowing it can use the
packet manager now.
This comes with a `cmake/` to add a missing include directory.
