[FIX] base,website,web_editor: handle key field on ir.ui.view for multi website

With multi-websites, we expect qweb views to have a key set as it is the key
that is used to find duplicates (two views with same keys are duplicate, the
one with a website_id set is more specific than the one without a website_id)

Thus, 5ff87e803967 sort on key in order to find the most suitable one.

It would crash if a qweb view is created without a key (False) as it can't sort
`bool` and `str`.

This commit:
  - Adds a generated key to scss views
  - Adds an SQL constraint to avoid QWeb views without a `key`
  - Generates a random key when creating a QWeb view without a `key`
  - Handle False key in `filter_duplicate()` by extracting views with False key
    before sorting, and then adding these views to the recordset

Note: We also want the key to be editable as it is now an important field with
      multiwebsite. Thus, we removed the readonly on this field.

+ fix python tests as we now force key on qweb views with sql constraint
+ pep8

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