backport stable branch and some vreg cleanups:
* move initialization_completed from cwvreg to base VRegistry class
allowing simplification of CWVregistry
* cleanup initialization process: __registered__ is now called after
initialization completed, by the relevant registry.
* fix/remove deprecated tests
[MESSAGES CONTROL]
disable-msg = C0301
[VARIABLES]
# Enable / disable this checker
enable-variables = yes
additional-builtins = _, display_name
[BASIC]
required-attributes=
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[TYPECHECK]
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