Add operator and function code
Add function/procedure call defs
Add numeric and some boolean op defs
Add some literal parsers
Add operator notes
Use non-optional param list (incorrect, fix it)
Update notes
Add more generic operator parser stuff (incomplete)
More work on the precedence parser
Finish expression-parser
Add system def file
Add vertigo package def
Fix :delimited parser expansion
Add parser expansions from the prep compiler
Add parser utilities
Declare package, add utility rule
Add vertigo-test package
Add integer and decimal AST node structs
Add decimal rule unit tests
Don't convert int/frac parts of a rational