LED: Add draw examples for 8x8 Matrix, add LED characters file.

[jorydotcom]

This is a small update to ledcontrol. It:

• pulls the character constants out of ledcontrol into a new led-chars file.
• adds a bunch of new characters, symbols, & patterns! 🙆‍♀️
• adds two new example programs to eg/ so you can play with the matrix characters.

😃 I hope you like it!

[jorydotcom]

build seems to have failed because I didn't add var - will update shortly!

[Resseguie]

@jorydotcom You'll need to add the example(s) to tpl/programs.json so that they are picked up when grunt examples is run. You can either supply a breadboard specific to the example (and named same as example) or re-use an existing one and specify in the programs.json file). If the other examples there aren't obvious, let me know and I'll help point you in the right direction.

[rwaldron]

@Resseguie do we have docs for that somewhere?

@jorydotcom make two entries like this: https://github.com/rwaldron/johnny-five/blob/master/tpl/programs.json#L218-L233 but slightly modified to include a re-used breadboard:

    {
        "file": "led-chars-demo.js",
        "title": "LED - Matrix Characters Demo",
        "breadboards": [
          {"name": "led-matrix"}
        ]
    }

You may want to add description, etc—I'll leave the rest for you to sort out.

[rwaldron]

rename lc => matrix

[jorydotcom]

Thanks @Resseguie - the LED Matrix breadboard works just fine, I think! Will update momentarily!

[jorydotcom]

fixes made - should I squash these new commits as well?

[rwaldron]

If you feel comfortable doing so, then yes, but otherwise I don't require it

[rwaldron]

LGTM, @Resseguie is this ok?

[Resseguie]

Sorry, I've been out of town this week. I don't have hardware with me to actually test, but the entries above look right at a quick glance.

[Resseguie]

@Resseguie do we have docs for that somewhere?

@rwaldron I don't think so, other than in was PR comments. Perhaps I should do a write-up under contributing guidelines, wiki, and/or a little news blurb about the new structure. Preference where?

[Resseguie]

@jorydotcom with the above entry to programs.json, if you run grunt examples it should generate those two new .md files under docs for you. Doing so will verify that your new entries look like you intended. Otherwise, Rick or I can generate them after landing your commits.

[Resseguie]

@rwaldron re: documenting this workflow, see #860 (I self assigned to knock that out when I'm back in town.)