Allow escaping of markdown characters in markdown editor

[ApeWare]

For Feature Requests

Desired Feature: Allow escaping of pipes, and other markdown characters, in markdown

For Bug Reports

• BookStack Version: 0.15.3
• PHP Version: 7.0.15
• MySQL Version: 5.7

Expected Behavior

Given the following markdown

 font-style | font-weight 
------------|------------
 normal     | 100\|300\|400
 italic     | 100\|300\|400 

it should render like this, as it does on Github:

font-style	font-weight
normal	100|300|400
italic	100|300|400

Actual Behavior

Currently escaping pipes, perhaps other characters as well, doesn't seem possible. In Bookstack it renders like this: