Add strictness

[Deleted user]

Quotes:

> asd
this is not part of the quote

Lists:

1. this is list one

this is not part of any list

1. this is list two
   this is part of the subitem, always strict indentation

Boldness:

**this is bold**
//this is italic//
__this is underline__

Strikethrough:

chose between this
~~this is strike through~~
and this
--this is strike through--
no need for double syntax

The characters are double in order to avoid conflicts with normal text and not have to escape too often.