Add structs in events to the bug list

[chriseth]

• come up with severity
• find earliest affected version
• potentially find regular expression (will likely also match enums) Buglist check script json path support #4841

Ref: #4644 (comment)

[chriseth]

First two items closed by #4820

Remaining item more likely to be solved with something like a json-path expression on the AST.