[hooks] major refactoring: * they are no "proper" appobject, selected when an event is fired according to its context * new module cubicweb.server.hook containing the Hook class and Operation class * deprecated SystemHook and PreCommitOperation classes * rewrite core server hooks as appobjects in the cubicweb/hooks directory -> deprecates hooksmanager, remove hooks, schemahooks, securityhooks cubicweb.server sub-modules -> new cubicweb.hooks sub-package -> get back to a (somewhat) working state

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from logilab.common.deprecation import class_renamed, class_moved

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from cubicweb.server.hook import Hook

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SystemHook = class_renamed('SystemHook', Hook)

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Hook = class_moved(Hook)