Added private member suffix "_" to end of keyCodes variables.
The keyCodes variables, like "KEY_UP", are now suffixed with the privat member line "_". So "KEY_UP" is now "KEY_UP_". Also, added key_[4] bool. This bool will be used for storing key states, and will ultimately be passed on to the player.
Increased key_ array element size.
Increased range from 4 to 85, so it may correspond with the keyCodes enum.
Incorporated key_ bool and added key testing.
Key states are now stored in key_. Assets::update() now tests key inputs by writing their bool value to the console window.