Add keywords/tokens to JEI

[TeamDman]

Each token can have a pseudo-item registered with JEI, the appearance being a String example of that token with the colorization (as opposed to a traditional 2d sprite/3d model).

When the user looks at the recipe or usages for that item, it shows one or more small example programs that demonstrate the keyword.

We can probably render a tiny text editor window in the way that JEI shows multiple recipes, with an "expand" button to make the editor pop out and use more screen space.

This would help users discover keywords and examples easier.

Could also have it show scripts, so if you look at the usages of a furnace it shows you the sample SFM furnace manager script.