Modified main file. currentGameState is set to SINGLE_PLAYER_GAME_STATE.
Several changes: Created separate files for constant and global variables. Structured code to their own files in order to keep everything a bit tidier.
Added constant GAME_PAUSED_STATE
Restructured game state handling a bit. Added UDT declaration at the top of main file. GamePaddle is now drawn to the screen.
Added AIPaddle with values and it is drawn to the screen.
Changed Player and AI Paddle color values a bit.
Merge: success. Small change to layout file.