Ability to force closing tag in specific cases

[magne4000]

Steam bbcode is ugly.
Lists are usually formatted like this:

[list]
    [*]aaa
    [*]bbb
    [*]ccc
[/list] 

The closing tag for [*] is not mandatory, but I'd like to be able to force a closing </li> even if [/*] is not present.
In this case, a newline or the closing [/list] tag marks the end of a list element.

[Cherry]

Thanks for the issue! Steam bbcode sure is ugly 😅

I'm not sure this is something we'll be able to fix ourselves in a timely manner, but would definitely encourage a PR that adds support for this.