* Fix CSS for live chat embeds
* Fix Markdown Lists in Comments
* Disable copy link menu option on livestream comments
* Fix nested indents in Live Chat
* Fix mentions and timestamps not parsed in bullet lists
* Highlight livestream comment and menu button on hover
* Fix mention parsing
## Issues
- The current version of the link handler doesn't seem able to control the livestream player's position.
- The "live" position is always 0:00 and everything behind it is a negative timestamp. The current timestamp parser doesn't handle negative values.
- The icon makes the screen too busy when there are lots of images in a page.
- Use src as the last resort for the text (I though `title` and `alt` was mandatory in markdown; apparently not).
## Issue
4797: Markdown preview breaks when using a lbry link in angle brackets
This is similar to the Embed case in commit dbcd677e.
## Change
Replaced it with a dummy link that looks like what the final outcome would be, but would not be clickable.
Again, similar to the embed case, unless there is a way to pass the store over, I don't have an alternative that makes sense: Adding a dummy router or replacing it as a regular <a> will just make React spew security errors.
Not being able to click it is not ideal as we (as a user) can't verify our links, but it's better than the current case of not rendering anything at all.
## Issue
4644: Markdown Preview breaks when <iframe> is present
Error: "Invariant violation: could not find 'store' ..."
## Change
Until we figure out a way to pass the store to the SimpleMDE preview formatter, just replace the embed with a stub region.
