beta 1: remove framebuffer crate, replace with own code, small fixes/features added

added some kanji, docs

docs/window-likes/reversi.md

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+See [Wikipedia](https://en.wikipedia.org/wiki/Reversi) for the rules of the game.
+
+## Usage
+
+Each square has a two-digit number on it. Type that number to place a piece on that square. If only one digit is typed, the backspace key can be hit to clear that digit. Black goes first.
+
+Once the game is over, the winner (if it is not a tie) will be announced, and any key can be hit to play again.
+
+There is currently no computer opponent, so this is a pass-and-play game.