initial Editor Gui
Added Signals and a filechooser dialog for open and save
remove unnecessary include in main
add SFML Widget to Gtkmm Window
show SFML Widget and add example shape
Add click and drop (mouse handling)
New GUI Design
make spinbuttons work

Signed-off-by: Benedikt Klotz <benedikt.knoppix@web.de>
adjust directory structure

Signed-off-by: Benedikt Klotz <benedikt.knoppix@web.de>
remove redundant files

Signed-off-by: Benedikt Klotz <benedikt.knoppix@web.de>