Render to grammar text.
Add getline.cs.
Add options for when the user hits Ctrl+C.
Start a basic repl when no args are passed on the command-line.
Add the new definitions to a dictionary. Print out the names when the user types 'list'.
Print out the full definitions in text form when the user enters 'print'.
Delete selected definitions.
Don't delete anything if any of the specified name are not found.
Save definitions to a file.
Also save all definitions referenced by the specified definitions, directly or indirectly.
Cleanup.
Load definitions from a file.
If the user specifies definitions, only print those out. Otherwise, print all of them.
Exit.
Check for problems in the definitions.
Don't try to print definitions that aren't there.
Add an extra blank line before the first printed definition.
Refactor command-line argument processing out of the Super method.
Clean up static fields and one option set.
Refactor command-line argument processing out of the Render method.