Interpreter for a toy imperative language
* Step forward through the program's evaluation
* Step backwards through the program's evaluation
* View all previously evaluated Instructions
* Inspect variable values at each previous step in the program
* View the current environment (in-scope variables and their values)
* Inspect a specific in-scope variable and its value
> stack setup
> stack build
> stack exec interpreter-exeThis will run with the default file. To specify another file run the following
> stack exec interpreter-exe <path-to-file>