[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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# Put here information about external resources / styles used by your cube,

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# or to overides existing UI properties.

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# Existing properties are available through the `sheet` dictionary available

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# in the global namespace. You also have access to a `data` function which

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# will return proper url for resources in the 'data' directory.

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# /!\ this file should not be imported /!\

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# CSS stylesheets to include in HTML headers

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# uncomment the line below to use template specific stylesheet

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# STYLESHEETS = sheet['STYLESHEETS'] + [data('cubes.%(cubename)s.css')]