[vreg] move base registry implementation to logilab.common. Closes #1916014 A new logilab.common.registry module has been created with content from * cw.vreg (the whole things that was in there) * cw.appobject (base selectors and all). In the process, we've done some renaming: * former selector functions are now known as "predicate", though you still use predicates to build an object'selector * hence `objectify_selector` decorator is now `objectify_predicate` * the top level registry is now `RegistryStore` (was `VRegistry`) Also there is no more need for the @lltrace decorator. On the CubicWeb side, the `selectors` module has been renamed to `predicates`. There should be full backward compat with proper deprecation warnings.

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CSS Coding Standards

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(Draft, to be continued)

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:Naming: camelCase

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Indentation rules

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- 2 espaces avant les propriétés

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- pas d'espace avant les ":", un espace après

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- 1 seul espace entre les différentes valeurs pour une même propriété

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Documentation

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Please keep rules semantically linked grouped together, with a comment about

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what they are for.

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Recommendation

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- Try to use existing classes rather than introduce new ones

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- Keep things as simple as possible while in the framework

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- Think about later customization by application

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- Avoid introducing a new CSS file for a few lines of CSS, at least while the

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  framework doesn't include packing functionalities

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