next: About display comment of sgf and read/write sgf with variation & Winrate.

[zsalch]

Closes #350

1. Add the display the comment of the sgf (C tag): Forgive me very lazy, directly displayed under the variation panel, please ignore the ugly style :(
2. Add the ability to read and write the sgf with variation
3. By the way, write the Winrate in the comment of sgf for each step (C tag): Just a little try

[zsalch]

new update:
fix the Winrate wrong when load the sgf with variation.

[featurecat]

sorry for the wait. I'll review this tomorrow!

[zsalch]

Thanks for your reply. Please ignore last commit (bd81db6: 2018/08/29 Multiple Weights Switching).
This is a pending change. I will discard the commit.

[OlivierBlanvillain]

@zsalch Could you please split this work into 3 distinct pull requests? Having everything in a single diff makes it hard to review.

Also, I personally dislike the idea of writing the win-rate in the SGF file. People have developed dedicated tools that might be better suited to do offline analysis of SGF files, it's not clear to me why this feature should be within the scope of Lizzie...

[zsalch]

@OlivierBlanvillain
I got it and will split the pull request.

About writing win-rate, some people like do it. I'll default turn off the feature and change it to be a hidden option in the config.txt.

[zsalch]

Close this pull request and split two new pull request: #364 #365

[OlivierBlanvillain]

@zsalch Did you end up committing the winrate to comment feature? (#308)