[ModGen] Issue with cardinality

[c3dr0x]

When generating entities with cardinality 0..1/1..1, 1..1/1..0 & 0..1/0..1 the generator issue FKs on both sides. It shouldn't.

[c3dr0x]

I think that the generation should be as follow:

• 0..1/1..1 & 1..1/0..1: FK must be on 1..1 side
• 1..1/1..1 & 0..1/0..1: FK must be on side that has the navigability option set, navigability can be set on both sides if necessary.

@durandx What is your input about it ?

see: get-focus/kinetix-tools@c9f29fb