Updating the presentation of message macros

[CharpentierLucas]

@vmassol

Let’s hope everyone will like icons (especially in inline mode where I feel it’s a bit too much). If we get complaints in the future we might need to have a configuration, or at least document a SSX to remove them.

There’s also a quick SSX fix (LESS for convenience):

.successmessage, .errormessage, .warningmessage, .infomessage {
  & > span {
    display: none;
  }
}

If they are still relevant by the time we merge, I’ll add those snippets to the docs

@vmassol

I think we need to discuss the title and image parameters. I don’t see how they are useful since they can both be specified in the content of the macro. In addition the title accepts wiki markup which will cause problems (depending on how it was used) with the new bold of the title.

Okay, I agree that those should be deprecated.
If that’s alright, I’ll revert the title changes from this PR (so that it can be merged soon), and open a new improvement ticket to:

• deprecate title and image
• Provide heading as a replacement, which does not accept markup and is always bold.