Initial commit.
Add statusbar (footprint 1).
Add statusbar (footprint 2).
Add fullscreen feature(footprint 1).
Add fullscreen feature(footprint 2).
Finish fullscreen feature.
Finish preference function by Gio::Settings.
 Implement About dialog .
Add sample settings files.
Merge branch 'master' of github.com:iltgcl/GtkmmSample