[ADD] hr_skills: Introduce a new module for employee resumé and skills

Purpose
=======

Consultancy companies need resumé and skills of their consultants.
For big projects, they often need to send them to their customers.
These informations are also useful to statistics.

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

New models
----------

1/ `hr.resume.line.type`
Types of resumé lines. e.g. *Experience*, *Education*, *Hobbies*

2/ `hr.resume.line`
It is a line in the resumé of an employee.

3/ `hr.skill`
Name of a skill. e.g *French*, *Python*, *Piano*

4/ `hr.skill.type`
Skills can belongs to a particular type. A skill type has skill levels associated.
e.g. *Languages*, *Dev*, *Music*

5/ `hr.skill.level`
Levels available for a particular skill type. Each level has a label
and a progress (between 0 and 100) associated.
e.g. *Intermediary (20%)*, *Advanced (85%)*, *Expert (100%)*

6/ `hr.employee.skill`
These are skills which employees have. It links an employee with a particular skill
and level.
e.g. Mitchell has an *Intermediary* level in *Python*

Access Rights
-------------

Only a `hr_user` can create/edit `hr.resume.line.type`, `hr.skill`, `hr.skill.level`, `hr.skill.type`.
If employees are allowed to edit their infos (setting), they can also create/edit `hr.resume.line`,
`hr.employee.skill` for themselves.

UI
--
Resumé lines are displayed, grouped by type, in a new 'Resumé' tab in the employee
form. Resumé lines can be reordered (handle widget)

Emloyee skills are displayed in the Resumé tab, grouped by skill type.

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