new string formatting for complex text strings

[oatmealine]

if you have a second parser (for eg. markdown) working after scrunkly, then you'll commonly find that to type something like this:

\*escaped asterisks\*

you will need to type something like:

say "\\*escaped asterisks\\*"

this is really unconventional and only needed to escape quotes. my idea is to introduce a new type of quote:

say `\*escaped asterisks\*`

backslashes has no effect in them, which also prevents you from typing the character ` in them, but i think that's mostly okay. alternatively strings similar to Lua's long strings could be used:

say [[\*escaped asterisks\*]]

the main issue is those are Hellish to parse with lua's regular expression tools