this allows most elements to be configured with the "exhaustiveFlags"
flag which ensures that _all_ of the element's flags must be set in the
context for it to be laid out.
When passing a `MessageElement` instead of an init table to
`Message:append_element` in a lua plugin, it would error with "Invalid
message type" suggesting that it calls `elementFromTable`, i.e. acts as
if a `MessageElementInit` table was passed.
```
Reviewed-by: Nerixyz <nerixdev@outlook.de>
Reviewed-by: pajlada <rasmus.karlsson@pajlada.com>
After #6909, we can clone message elements. With this PR, we can clone
whole messages. The messages are non-frozen afterward, so plugins can
edit their properties and add/remove elements.
Reviewed-by: pajlada <rasmus.karlsson@pajlada.com>
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