Extended math support

[bennyboer]

Extend the math support by supporting more MathML elements. This is a follow up issue for the initial math support implemented in #16.

Tasks

• [ ] Support units in the attribute values (for example mm, px, cm, em, ..)
• [ ] Table support
  • [ ] <mtable> element
  • [ ] <mtr> element
  • [ ] <mtd> element
• [ ] <menclose> support
• [ ] <maligngroup> and <malignmark> support
• [ ] <merror> support
• [ ] <mfenced> support
• [ ] <mphantom> support
• [ ] Full <mo> support
  • [ ] Support for displaying large operators (parenthesis, brackets, sum, product, ...) - Attribute largeop
  • [ ] Attribute maxsize
  • [ ] Attribute minsize
• [ ] mstyle support

If #23 is already done before working on these tasks, the LaTeX to MathML converter needs to be adjusted as well!