[form] add a new ignore_req_params attribute on field controlling value's retreival for such field, such as eid/__type in entity forms, we don't want to consider values from req.form since we may get undesired value (as reported by #714766). This new attribute allow do specify that we don't want to consider req.form in such case. Also, it seems that retreival of form values after a validation error suffer from the same problem, so don't use form_previous_values for field with ignore_req_params set to True (XXX though I suppose that may not be correct in some cases).

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[MESSAGES CONTROL]

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disable-msg = C0301

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[VARIABLES]

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# Enable / disable this checker

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enable-variables = yes

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additional-builtins = _, display_name

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[BASIC]

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required-attributes=

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attr-rgx = (w|[a-z_][a-z0-9_]{2,30})

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variable-rgx = (w|[a-z_][a-z0-9_]{2,30})$

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argument-rgx = (w|[a-z_][a-z0-9_]{2,30})$

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[TYPECHECK]

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generated-members=debug,info,notice,warning,error,critical,exception