1.2 frame selection

I added a bar of canvases which shows al the frames so it will be easier to select frames and get an overview of the animation. I also added an export menu which can be used to export the animation in a different frame rate than the playback speed which lets you make use of the interpolation functionality while exporting. The last and smallest update is that i added keyboard shortcuts space to pause/play, left right arow to move between frames and r/m to select rotate or move.