try_play_color (and auto-formatting.)

[lukaszlew]

Sometimes there are two moves in a row of the same color.

[Sagebati]

Hi thanks for your PR, do you have a sample of code where that happens ?

[lukaszlew]

This is not a matter of code, but a matter of data.
I have plenty of SGFs that have 2 or more black moves in a row for various reasons.
Ability to play multiple moves of the same color is essential to a Go library.
In the past i had to support that use case in my own Go libraries
eg: https://github.com/lukaszlew/libego