Support alternate bullet style per level

[cbess]

Similar to web browsers, draw different bullets at different levels.

To test:

• Create an unordered list
• Add multiple levels to it
• Notice the bullet style for level one is different than level two and three

Before	After

[cbess]

@crazytonyli can this be merged?

[cbess]

@diegoreymendez it is ready for review again

[diegoreymendez]

@cbess - Unfortunately, after my departure from Automattic I'm no longer maintaining this project.

You may need to ping one of the other maintainers to get this reviewed and merged.

[cbess]

@mokagio I've made the necessary changes and its ready for review

[cbess]

@fluiddot this is connected to #1353
Can this be reviewed and merged?

[diegoreymendez]

@jleandroperez, @frosty - Hey folks, any idea who could look at this one?

[jleandroperez]

@twstokes Do you think it'd be possible to validate this changeset?

I'm afraid I haven't been involved with WPiOS / Jetpack in a long, long time, and we'd really need to ensure nothing else breaks.

Thanks in advance!!

P.s.: Hola @diegoreymendez !!!

[twstokes]

@twstokes Do you think it'd be possible to validate this changeset?

👋 Howdy @jleandroperez, will be happy to give it a look. I have a slight backlog due to the new year, but will check this soon.

[jleandroperez]

Thanks a million @twstokes !!!

[cbess]

@twstokes I'll make those Nit: changes you mentioned