allow hiding "comment" area

[vn971]

I sometimes use gobandroid as a simple goban. Now, when used as a goban, there really is no use in the "commenting" area. What's worse, it's wide, and when you accidentally click on it a keyboard pops out. As I mentioned on another issue, I used the app with a 3 year old kid, and we accidentally clicked the area a lot. I think it would be good to have a way to hide the commenting area in Settings.

// What's funny, the kid actually learned to surround pretty fast, and even defend, too. But 'ya know, not touching anything accidentally is still hard:D