- rename ext_normalise to ext_normalize
- move modules to from /usr/lib to /lib
- centralize make rules

Make the compat libs of npf extension shared libraries go to the
compat directories instead of overwriting the arch native libs.
Also, make sure the compat directories get created. Tested on amd64.

Implement dynamic NPF extensions interface. An extension consists of
dynamically loaded module (.so) supplementing npfctl(8) and a kernel
module. Move normalisation and logging functionality into t

Implement dynamic NPF extensions interface. An extension consists of
dynamically loaded module (.so) supplementing npfctl(8) and a kernel
module. Move normalisation and logging functionality into their own
extensions. More improvements to come.

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