Added an "About" dialog.

[AdamuKaapan]

I decided to go ahead and do a simple about dialog to try and tackle issue #439 (I wanted to try and contribute, and that seemed like an easy place to start that wouldn't mess with too much). Slight disclaimer, I don't know anything about FXML or the conventions/structure of this project: I derived what I can from what I saw (mainly in the settings dialog), but this may be entirely different than what you want/need.

Also, a slight introduction. My name is Adam, I'm a Java programmer with FRC Team 3268, the Valhallabots. I'm beginning to be very interested in vision processing (both in and out of FRC), and I'm hoping to maybe contribute to this project in my spare time, even if it's just small random things like this.

Thanks for making this awesome project, I'm looking forwards to hopefully using it this year!

[codecov-io]

Current coverage is 49.63%

Merging #477 into master will decrease coverage by -0.71% as of acbec49

@@            master    #477   diff @@
======================================
  Files          130     131     +1
  Stmts         3879    3935    +56
  Branches       426     428     +2
  Methods          0       0       
======================================
  Hit           1953    1953       
  Partial        110     110       
- Missed        1816    1872    +56

Review entire Coverage Diff as of acbec49

---

Uncovered Suggestions

1. +0.61% via ...jectAboutDialog.java#55...78
2. +0.53% via .../ExceptionAlert.java#83...103
3. +0.48% via ...jectAboutDialog.java#32...50
4. See 7 more...

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[JLLeitschuh]

I'd love to see the logo in the about as well.
I think the about should be under another menu separate from "Tools" probably a menu like "Help". @ThomasJClark What do you think?

This is what the "About" screen looks for on Mac and I'd like to see it look more like this.

[AdamuKaapan]

Alright, I'll go ahead and do that. Good idea!

[AdamuKaapan]

Does that seem better?

[JLLeitschuh]

Can you upload a screenshot?

[ThomasJClark]

Clicking the hyperlinks just seems to freeze the application up. Can you use hostServices.showDocument()?

[AdamuKaapan]

Here's a screenshot: https://gyazo.com/ec9100830ae8d9202b3ae08015a4054d

[AdamuKaapan]

As far as using HostServices, I don't see a way to get the instance of the Application unless you already have one set up? I could probably get one by adding a static variable somewhere or passing it through a few layers of menus? I'm not sure why those links are hanging... I'm on Windows 10 64-bit w/ Java 1.8.0_60 in case that's relevant. Is there anything in the console when you use the link?

[ThomasJClark]

It would probably be a good idea to allow access to the Main instance, since it's a singleton anyways. So, you could do Main.getInstance().getHostServices().showDocument(...).

[AdamuKaapan]

Should I do that or leave that to you guys?

[AdamuKaapan]

I'll just push what I did: see if that works.

[AdamuKaapan]

Any updates on whether this works or not?

[JLLeitschuh]

@ThomasJClark Says it looks small on Hi-DPI screens. He said he'll include a screenshot later.

[JLLeitschuh]

Resolved by #588