Commits on Mar 22, 2023

1. (fix): Sub variables only saw References …

   So, when the Sub parser goes through, you can get a blob like:
   
   ```
   "Fn::Sub": "echo ${lol}"
   ```
   
   which would transform lol into a variable, as it's surrounded by ${}.
   It turns out that CFN doesn't need a reference of any kind, and will just
   output the string inside if it doesn't match any origin. Meanwhile, my system
   would attempt to topological sort `lol` off a Logical Id, but not find a Logical
   Id! So it would crash.
   
   There were a few other bugs in this patch (escaping ticks, simplify the parser) that
   aren't worth mentioning.

   

   iph committed Mar 22, 2023
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