Mark Stemm 07abb89f36 Pass back warnings when loading rules ...

Add the notion of warnings when loading rules, which are printed if
verbose is true:

 - load_rules now returns a tuple (success, required engine version,
   error array, warnings array) instead of (true, required engine
   version) or (false, error string)
 - build_error/build_error_with_context now returns an array instead of
   string value.
 - warnings are combined across calls to load_rules_doc
 - Current warnings include:
   - a rule that contains an unknown filter
   - a macro not referred to by any rule
   - a list not referred to by any rule/macro/list

Any errors/warnings are concatenated into the exception if success was
false. Any errors/warnings will be printed if verbose is true.

Signed-off-by: Mark Stemm <mark.stemm@gmail.com>

2021-01-19 10:37:55 +01:00

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