Adds drag and drop capability to 2d token

[vdfdev]

Checklist

• Use a separate branch in your local repo (not master).
• Test coverage is 100% (or you have a story for why it's ok).

[vdfdev]

FYI This decrease in coverage does not come from the files I changed:

[jasonharrison]

@flamecoals is in-flight right now and his internet pass expired. He asked me to post this GIF demonstrating drag/drop:

[nicolodavis]

For some reason this PR seems to be affecting the overall project coverage status (on master) as reported by Coveralls. Weird!

https://coveralls.io/github/nicolodavis/boardgame.io

[vdfdev]

For some reason this PR seems to be affecting the overall project coverage status (on master) as reported by Coveralls. Weird!

https://coveralls.io/github/nicolodavis/boardgame.io

How so? This is not even merged yet, very weird.
Maybe the badge is the minimum coverage of all branches? 3d seems to have only 89% coverage, thats probably why?

[nicolodavis]

No, for some reason Coveralls thinks that this is a commit made on the master branch (it doesn't seem to distinguish between PR's and actual commits on master).

I'm not sure if it is Coveralls that's broken or the CI that's sending over incorrect branch data for PR's.

[nicolodavis]

Some behavioral comments:

1. Dragging a piece should cause it to appear on top of everything else (right now you can drag a white piece and it appears below the black).

2. Dragging a piece outside the left or bottom sides of the board results in an error.

3. Dragging a piece out and back into the original location should probably result in the same state prior to dragging (right now it still leaves the moves highlighted).

[vdfdev]

Some behavioral comments:

1. Dragging a piece should cause it to appear on top of everything else (right now you can drag a white piece and it appears below the black).
2. Dragging a piece outside the left or bottom sides of the board results in an error.
3. Dragging a piece out and back into the original location should probably result in the same state prior to dragging (right now it still leaves the moves highlighted).

Ok, I will take a look into this later and get back to you.

[vdfdev]

@nicolodavis These issues should be addressed now. I also needed to add some logic to handle mobile better, which is so annoying, because touch screen behaves a little bit different than mouse. I am using this in my new game, and it works well in mobile with the right CSS to avoid scrolling.

Do you have any idea when you will merge the 3d branch into master? because I am having to maintain a separate fork in order to be able to use this in my project. Do you need help with anything in order to merge? I saw that there is a lot of untested code in the 3d folder.

[vdfdev]

The code I sent works in desktop, android but not iOs. I am changing it to work everywhere. It is very ugly but each environment behaves differently...

[vdfdev]

OK, the code now works on iOs, Android, Chrome desktop... I spent hours and hours trying to figure out a way to abstract away all this mess, and I think I succeeded :D

[nicolodavis]

I'll try to merge the 3d branch in after this PR. There hasn't been much progress on the 3D components, so maybe I'll scrap it for the v1 release and add it as a nice to have for later.

[vdfdev]

FYI, I just found out that the click isnt working for Android. I will fix it soon... wait for merging

[vdfdev]

Ok, now it works on Android too :)