Add custom TagHandler for <code> tags to add monospace typeface#1149

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DieBauer wants to merge 2 commits intohidroh:masterfrom

DieBauer:883-support-monospace-code-in-comments

Commits on Sep 22, 2018

Downgrade the html5 `<pre><code>` tags with html4 `<tt>`
DieBauer
committed

Commits on Sep 23, 2018

Implement code highlighting with custom code `Html.TagHandler`
DieBauer
committed