GDScript: Fix @warning_ignore annotation issues

[dalexeev]

• Closes @warning_ignore() annotation don't work with all warnings #56592.
• Closes @warning_ignore doesn't work for conditions #73222.
• Closes warning_ignore attribute ignored in for loop range expression #84719.

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• Fix warnings produced in the parser are not ignored since @warning_ignores are resolved and applied in the analyzer.
• Fix annotations before blocks (if, for, while, etc.) applied to the first most nested statement due to a bug with recursion.
• Fix parsing of standalone annotations in the script header.
• Deprecate outdated and unused warnings PROPERTY_USED_AS_FUNCTION, CONSTANT_USED_AS_FUNCTION and FUNCTION_USED_AS_PROPERTY. In 4.x properties, methods and signals share the same name scope, accessing methods without parentheses returns a Callable.
  • These warnings have also been moved to the end of the list. This does not break compatibility since the enum is not exposed to the public API.
  • We could probably remove these warnings, since they are project settings (not real properties) and it is unlikely that anyone would use them.
• Add missed STANDALONE_TERNARY (a special case that replaces STANDALONE_EXPRESSION, since the ternary operator can have side effects) and UNUSED_SIGNAL warnings.
• Add support for @warning_ignore in match (to ignore the UNREACHABLE_PATTERN warning).
• Add support for pass in match.

Production edit: closes godotengine/godot-roadmap#64

[adamscott]

Nice PR. Seems to fix a lot of issues. Maybe we could merge this PR before dev4, as it changes a lot of lines? cc. @akien-mga

[akien-mga]

Needs resyncing the docs for the is_deprecated -> deprecated change.

[adamscott]

Reviewed during the GDScript meeting. Other than small nitpicks, the PR seems absolutely fine! Thanks for your hard work, @dalexeev.

[akien-mga]

Thanks!

[MikeSchulze]

Thank you very much!