[MERGE] ir_actions, ir_cron, base_automation: refactor server, scheduled and automated actions

This commit simplifies server code execution by allowing only server
actions to execute code. Scheduled actions (ir.cron) and automated
actions (base.action.rule renamed to base.automation) now delegate all
code execution to their own server action, using inheritance. Those
models now contain only fields related to cron details for scheduled
actions, or triggers and filters for automated actions.

Server actions have been simplified. Main options stay the same but
complex options in creation / update have been removed. Those should
be done using code-based server actions. A server action type to add
followers has been added.

Views have been updated accordingly. Base form view of server action
is used as a base for scheduled and automated action. Editing a cron
or an automated action looks like editing a server action with some
added fields.

Thanks to @fpodoo for the original idea and preliminary work. Thanks to
@jpr-odoo for first developments and @tivisse for improving and cleaning
the work. Thanks to @jem-odoo and @rco-odoo for reviewing.

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