sabre/TODO

# Bugs
- Fix `parser::tests::test_parse_compound_ops_with_identifier_first` test


# Features 
- Add CLI
- Add else/if else branch to conditionals
- Add while loop
- Add for loop
- Add type system
- Write stdlib with builtin functions


# Cleanups
- Generalize function/if/loop bodies into a "Block" node to remove redundancy