IDs of headings with inline tokens (link, em, bold...)

[Feder1co5oave]

PR for #450

I hope it doesn't seem overkilling, I kept it as small as possible.
Comments are welcome. I'll be posting some tests, if I can manage to make them work.

Meanwhile I tested it with

### Heading with a [link](http://github.com/)

### Heading with some _italic text_

### Or some **strong**
(which doesn't really make any difference, here)

### Or even `code`

### What about ~~strikethrough~~

and I got

<h3 id="heading-with-a-link">Heading with a <a href="http://github.com/">link</a></h3>
<h3 id="heading-with-some-italic-text">Heading with some <em>italic text</em></h3>
<h3 id="or-some-strong">Or some <strong>strong</strong></h3>
<p>(which doesn&#39;t really make any difference, here)</p>
<h3 id="or-even-code">Or even <code>code</code></h3>
<h3 id="what-about-strikethrough">What about <del>strikethrough</del></h3>

which looks good to me.

Fixes #450, fixes #510

[F1LT3R]

Is this still being looked at @chjj ?

[Feder1co5oave]

@F1LT3R definitely no.

[F1LT3R]

As in... it shouldn't be, or... it hasn't been?

[Feder1co5oave]

I meant marked is not being maintained any more

[F1LT3R]

Ah Ok. Thanks @Feder1co5oave.

I've just been testing out your clean-segments commit and I think it's a great improvement.

Is there something better NPM module for markdown that I should be using instead?

[Feder1co5oave]

I'm still with marked, but there exist some more modern and maintained parsers out there. I haven't tried any yet so I can't help you.

[F1LT3R]

Thanks

[JCMais]

@F1LT3R try https://github.com/markdown-it/markdown-it

[F1LT3R]

Thanks @JCMais !!

[joshbruce]

#981

[Feder1co5oave]

I'll try and provide some tests, I think this is still relevant, even if it covers some edge cases only.

[Feder1co5oave]

Added test cases.

[joshbruce]

Getting two failing tests. Want to make sure they're because of some things fixed elsewhere before merging this in...if nothing else, they should be totally unrelated.

#10. def_blocks failed at offset 20. Near: "<blockquote><p>hello</p><p><ahref="foo">1</a>:hell".


Got:
<blockquote><p>hello</p><p><ahref="foo">1</a>:hell


Expected:
<blockquote><p>hello[1]:hello</p></blockquote><hr>

#32. links_reference_style failed at offset 878. Near: "tioncannotinterruptaparagraph.</p><p><ahref="/baz">bar</a></".


Got:
tioncannotinterruptaparagraph.</p><p><ahref="/baz">bar</a></


Expected:
tioncannotinterruptaparagraph.[bar]:/baz</p><p>[bar]</p><p>H

[Feder1co5oave]

I confirm that they are related to something else, and they both should be solved by my two [commonmark] PRs.