Jeremy

not sure how pull requests work from the site, but pull my branch for working interface code

also, i changed some of mark's towerCommandLibrary. instead of hotkeys to place towers, you just left click on the appropriate tower button (only level 0 towers working) and then click on any valid tile to place. right click to remove tower. pause and unpause buttons not implemented yet. neither is display boxes. marks tower manager needs to reset itself in ~GameStatePlay() destructor call.

map editor save & load use the same file "testmap2.xml" no user selected filenames yet.