Remove old preloading diff.
Fun-Stuff wrap all content. Increased Pixel Size.
Draw rectangle around special frames. Show grid.
Adapt background-Color. Remove Grid again.
Mark special frames in initialisation
Merge pull request #35 from MaPePeR/specialframe-preloadingindicator

Shows a Rect around the special frames in the preloadingindicator
All special frames get a yellow box on preaload indicator now.
Added a play in reverse options because why not?
Fixed reverse play speed change problem.