Purpose
=======

It is currently difficult to know exactly what is used for costs
and services on the contracts.

Hence it make it difficult to evolve the fleet application
We should clean the models in order to have something that is clearer

Specification
=============

Cleanup of models: removed Fuel and Cost. Contract and Services are no
longer inheriting Cost and are seperate models simplifying the use of
Fleet. A contract now has included services and they are no longer
generating cost.

closes odoo/odoo#34090

Taskid: 1931775
Related: odoo/enterprise#4572
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

Purpose: Improve fleet for a better usability

Dashboard:
  - Replace 'leasing' button by a contract status icon in kanban tiles
  - Add a link to contract
  - Link to vehicule form when clicking on the tile

Vehicle form:
  - Track contract status in a chatter
  - Add a model_year

Contracts:
  - Imporve the states names
  - Split service types in two list views service/contracts
  - Execute a cron once a day to upgrade contract status
  - Add a new contract status is introduced 'Expiring Soon' to help
    spot contracts that will expire until 15 days with a filter.
  - Add a 'group by vehicle' to improve list usability

Fuel logs view: Add an an odometer column

The purpose of this commit is to handle code execution only in server
action and delegate schedule management to ir_cron model.

ir.cron model now inherits from ir.actions.server. Fields model, function
and args are removed as well as the logic to handle them. There is no
more code manipulation and evaluation in ir_cron, only a call to the run
method of ir.actions.server.

Cron form view use server action form view as primary view. This way
automated actions use the same base form as server actions with
cron details added.

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