Updated makejar.bat to remove all .class files before compiling.

Signed-off-by: Opti <martingronlund@live.se>
Merge remote-tracking branch 'remotes/origin/master' into dev
Added gourad shading for our trademark rectangle, cause I can.
Updated the game loop to show fps in the title of the window.

Signed-off-by: Peter Mårtensson <veritas.is.me@gmail.com>