The ability to disable standard block/inline syntaxes

[lotusprey]

Problem

I need to parse markdown that doesn't comply with the popular specs. I can manage implementing custom syntaxes, but a roadblock I've hit is that the standard block/inline syntaxes, which are forcefully included, parse improperly some data (improperly, as to the custom spec that I have to follow).

Example

<center><a>**some text**</a></center> is parsed as **some text**, while I want some text. The block parser wraps it in a Text element, but UnparsedContent is what I need.

Possible Solution

Maybe the markdownToHtml function can have two optional parameters - withStandardBlockSyntaxes and withStandardInlineSyntaxes - that would be true by default. Disabling them will prevent the BlockParser and InlineParser from auto-including the standard syntaxes.

---

Another thing is that I don't need the functionality of all the standard syntaxes and excluding them may improve performance a little.