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 Concurrent VM Specification (#476)

* Translate compiler from Source to Typescript

* Add functions to compile and print to Source 3

Added methods to access compiler through `parse_and_compile` and
pretty_print the instructions through `print_compiled_program`. These
are temporary methods that will be removed in the future.

* Update snapshot

* Indicate unused code blocks

* Use window.console.log

* Add machine from lab

* Update snapshot

* Let VM run multiple times

* Refresh RTS on every run

* Introduce mutability to language

Introduce mutability to language. Index table is now a 2D Array of name,
isVar pairs, where isVar determines whether a name is mutable or not. To
support mutability across functions, when an environment is extended, it
maintains a reference to the parent's environment to allow it to modify
names in that environment.

* Add support for block environments

* Add support for If Statements

* Do not use window if running in node

* Return value for tests

* Refactor console.log calls

* Add Opcodes and basic util for SVML Compiler

* Allow localNames to traverse blocks

* Add variable renaming

* Update compile loop

* Add support for Source 1 to compiler

* Add debug util for svml-compiler

* Add README

* Describe mutex

* Fix rst

* Fix primitive calls

* Fix rst

* Fix BR argument

* Add support for While loop

* Add support for break and continue

* Add support for array literals

* Add support for array assignments

* Add support for calling primitive functions

* Add support for for loops and fix return

* Use display instead of console.log for print compiled program

* Copy old machine

* Fix bugs in compiler

* Disallow return in loops

* Use Source errors for const reassignment and undefined variable

* Update compile to use validator

* Replace all prints with return str

* Implement machine functions to match compiler opcode... (continued)

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