Avoid conflicts with Markdown syntax

[jpmvferreira]

Some triggers might have characters used as special characters in the Markdown syntax, for example from my espanso-mega-pack repository the package markdown-shortcuts has the following:

- trigger: ":strike:"
  replace: "~~$|$~~"

Which when transformed into the Markdown table in plain text is ~~$|$~~ which obviously in Markdown looks like $|$.

Ignoring the issue with the | character on tables, as it was mentioned in #2, adding a way to detect this and using the back slash to escape special characters, e.g.: \~\~$|$~~ which renders to ~~$|$~~, would be great.