New tetris

New version of tetris that now has music and changing backgrounds.
Backgrounds are set to a really low level system so that they could
easily be tested within 1 and 2 lines being completed.

The next box now shows the color of the current falling block still can
not make the shape appear there now make it the next block to fall.

Also unable to figure out to cause game over state or auto close game
once hitting top.
Merge branch 'master' of https://github.com/buster0944/Tetris-XNA