Merge: model: remove ModelView

ModelView had a good life, now is the time to change.

I replaced all the services from ModelView by `collect_*` methods combined with a `ModelFilter` (91072e1).
All the following commits modify the depending tools to use `model_collect` and `model_filter` instead.
Some test results changed because of the new ModelFilter dependency.

> RIP ModelView

Pull-Request: #2691
Reviewed-by: Jean Privat <jean@pryen.org>

diff --cc src/nitpackage.nit
Simple merge