Implement more of a Markdown parser and be able to read and write entries without loss

[Trilarion]

The current way of parsing the markdown parsing is very simple and heavily relies on regular expressions. Other markdown parsers are doing the same, but we should try to import and export the entries more generically, to allow for a greater flexibility of the format.

I wonder what can be learnt from other Markdown parsers (ignoring the rendering part) out there. We have:

• https://github.com/lepture/mistune
• https://github.com/Python-Markdown/markdown
• https://github.com/frostming/marko
• https://github.com/FSX/misaka
• https://github.com/hhatto/python-hoedown

[Trilarion]

Since we are only supporting a subset of Markdown, but on the other hand, have some special conventions on top of Markdown, I will use a general purpose parser (currently testing Lark) and write my special grammar for the database entries, the developer and originals file as well.

[Trilarion]

With Lark and a custom grammar I could solve the problem and can ready and write my special Markdown now. I can also extend the structure later on.