Purpose of this commit is to remove the link between Hr Contracts and
base automation. This has two consequences
* automated actions used to compute contracts state are transformed
into scheduled actions. Crons will do the job just as fine;
* option to use employee contract in automated actions is removed
and put in its own bridge module;
This allows to remove the dependency between the two addons.
First step towards cleaning and improving automated actions is to
correctly name things. base_action_rule module is therefore renamed
to base_automation. Model is also renamed to base.automation.
xmo-odoo