Web based front-end

[lk16]

I am working on a web based front-end for goboy, using websockets.

• video is sent frame-by-frame as base64 encoded PNG
• input is sent back from the browser over the same websocket

The current state is crude but working implementation, which I just hacked up in the last hour or so.

Screenshot:

How to run? Something like this:
go run --tags gtk_3_10 ./cmd/goboy/main.go -frontend web ~/yellow.gbc
Then go to http://localhost:8080/ to play.

Some things to be improved:

• sound is still sent via the oto.Player, this could be sent over the websocket as well
• current implementation assumes at most one button press/release per "frame"
• converting from 3D array of bytes to PNG is slow (this is independent of this PR, I have some fixes on another branch)
• the html and js code are not that great.
• the jquery library is outdated. I reasoned that we don't want to depend on external resources, so the jquery is in the repo.

Please check it out and let me know what you think!

[codecov]

Codecov Report

Merging #31 into master will decrease coverage by 2.89%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
- Coverage   71.13%   68.23%   -2.90%     
==========================================
  Files          23       25       +2     
  Lines        2494     2600     +106     
==========================================
  Hits         1774     1774              
- Misses        685      791     +106     
  Partials       35       35              

Impacted Files	Coverage Δ
pkg/gb/io/dummy.go	0.00% <0.00%> (ø)
pkg/gb/io/pixelgl.go	0.00% <0.00%> (ø)
pkg/gb/io/web.go	0.00% <0.00%> (ø)

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