Add ability to customize ordering symbols for ordered lists (e.g. abc or latin numerals)

[erukumk]

Checklist

Please replace the space inside the brackets with an x if the following items apply:

• I've verified that I use the latest version of the add-on by redownloading it from AnkiWeb
• I've verified that I use the latest version of Anki by checking at https://apps.ankiweb.net#download
• I've checked if anyone else suggested this feature before by looking through the issue reports.

Problem case

I like the ordered list to have different type of numbering for sub list, similar to that of unordered list.

Solution

Concisely describe the solution you would like
The first ordered list number is 1, it would great if the first sub ordered list to be i.

Concisely describe alternatives you've considered (if any)
I get this done by going to html and modifying the ordered list element.

More information

Screenshot: