[MIG] web_responsive: Migrate to v12 and refactor

This migration includes a full refactoring to make this module more
maintainable. Some things that have changed:

- Removed external libraries.
- Change Less for Scss.
- Reduce ES and XML to the minimal required needs.
- Implement as much features as possible with just Scss.
- Remove copyright from `__init__.py` files.
- Trigger the new hotkeys system from Odoo v12 with `Shift+Alt` instead
  of just `Alt`, and restore some good old hotkeys (`E` for "Edit",
  `D` for "Discard", and `A` for "Apps menu").
  See https://github.com/odoo/odoo/issues/30068 on the matter.
- Control panel breadcrumbs are collapsed into a single backwards icon.
- Add FA icons to most common buttons in control panel.
- Hide text in XS for those buttons, to have a slicker phone experience.
- Lots of gifs in the README!

web_responsive/models/res_users.py

@@ -0,0 +1,26 @@
+# Copyright 2018 Alexandre Díaz
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import models, fields
+
+
+class ResUsers(models.Model):
+    _inherit = 'res.users'
+
+    chatter_position = fields.Selection([
+        ('normal', 'Normal'),
+        ('sided', 'Sided'),
+    ], string="Chatter Position", default='normal')
+
+    def __init__(self, pool, cr):
+        """ Override of __init__ to add access rights.
+        Access rights are disabled by default, but allowed on some specific
+        fields defined in self.SELF_{READ/WRITE}ABLE_FIELDS.
+        """
+        super(ResUsers, self).__init__(pool, cr)
+        # duplicate list to avoid modifying the original reference
+        type(self).SELF_WRITEABLE_FIELDS = list(self.SELF_WRITEABLE_FIELDS)
+        type(self).SELF_WRITEABLE_FIELDS.extend(['chatter_position'])
+        # duplicate list to avoid modifying the original reference
+        type(self).SELF_READABLE_FIELDS = list(self.SELF_READABLE_FIELDS)
+        type(self).SELF_READABLE_FIELDS.extend(['chatter_position'])