Renamed snakeGame.c to snakeSinglePlayer.c

I also included a delay into endGame for presentation. In final versions of this code, it would be represented by a single usleep call rather than a looped call to frameTest -- it is implemented as it is to make modifying the code to run on Linux or Windows computers easier right now.

Notices: (unchanged from last commit)
-This code meets the main functionality of Snake and has no known bugs, and is therefore considered near completion. Besides optimization, this code will not get a lot of attention until input and output functions and aesthetic design decisions are finalized later in game-o-matic's development.
-This version of the code treats a long side of the LED array as the bottom of the screen. Due to how orientation-independent most of Snake's mechanics are, this will be easy to change later.
-This version of the code includes a placeholder menu. It also includes test input handling for Windows, which can be enabled in Windows by de-commenting everything below the two "/*Windows:*/" tags and commenting everything below the "/*Linux:*/" tags, as well as de-commenting the body of getLeftInput(). The snake is then controlled with WASD.

To do:
-Optimized and clean up the code in general.