Added Timer object for managing framerate of game loops.
Added tile collision handling to the Player object.
Merge branch 'master' of https://github.com/mtjohns1/Demon-Tower-HGD.git
Merge branch 'master' of https://github.com/mtjohns1/Demon-Tower-HGD.git
Merge branch 'master' of https://github.com/mtjohns1/Demon-Tower-HGD.git
Added .draw to Room and Tile objects, updated mobile.draw() to take a
list of Sprites instead of a graphics object. All drawing methods now
generate sprites and add them to a provided list.