Add a "toDocs" method to Grammar Programs, to automatically generate markdown docs from Grammar files

[breck7]

No description provided.

[breck7]

from discussion with ahmed

[breck7]

Other ideas for a name: toReadMe()/toTutorial()

[breck7]

Here is some pseudocode for the template:

# Documentation for {grammarName}

{grammarName} is a Tree Language for {description}. {grammarName} is built by {authors}, was first started in {year}, and the project homepage is {website}.

This document is for {grammarName} version {versionNumber} and was auto-generated using the [JTree library](linkToJtree) from the Grammar file for {grammarName} found {linkToGrammar}.

## Fun facts

{grammarName} has:
- {cellTypes.length} cell Types
- {nodeTypes.length} nodeTypes.
- The entire source code for this language is {nLines} lines long.

## Quick Example

{rootExample}

## Full Grammar in Tree Format

{dumpGrammarAsFamilyTree}

## NodeType Dictionary

{nodeType defs as table}

## CellType Dictionary

{cellType defs as table}

## Sample program analyzed as spreadsheet

{add this method}

[breck7]

Basic version added