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Render html tags inside img alt as their original text (#979)

Spec is not clear on how to handle this. Three variations exist:

```
$ echo '![text <textarea> text](image.png)' | /home/user/commonmark.js/bin/commonmark
<p><img src="image.png" alt="text <textarea> text" /></p>

$ echo '![text <textarea> text](image.png)' | /home/user/cmark/build/src/cmark
<p><img src="image.png" alt="text &lt;textarea&gt; text" /></p>

$ echo '![text <textarea> text](image.png)' | /home/user/.local/bin/commonmark
<p><img src="image.png" alt="text  text" /></p>
```

Prior to this commit:
 - when HTML tags are enabled, tags were removed (as in Haskell version)
 - when HTML tags are disabled, tags were escaped (as in C version)

After this commit:
 - tags will be escaped (as in C version) regardless of HTML flag

+ render hardbreaks as newlines, same as cmark

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