model: implements lookup_first_definition with a default code

Signed-off-by: Jean Privat <jean@pryen.org>
niti, nitg & rta: use lookup_first_definition

Signed-off-by: Jean Privat <jean@pryen.org>
typing: enable calls on a conflicting local property (with a warning)

Signed-off-by: Jean Privat <jean@pryen.org>
model: implements lookup_next_definition

Still static however.

Signed-off-by: Jean Privat <jean@pryen.org>
nitg: new complier service supercall

Signed-off-by: Jean Privat <jean@pryen.org>
tests: update nitg-s base_attr_gen_alt1

Not sure when this was broken however

Signed-off-by: Jean Privat <jean@pryen.org>
tests: force live methods in base_*_variance to helps nitc-g

Signed-off-by: Jean Privat <jean@pryen.org>