EogWindow: disable the open-with and recently-used menus

Disable the open-with and recently-used code, to prevent compile errors. They
are commented because we might still need them in the new design, but are
disabled to not hold us back for now.

https://bugzilla.gnome.org/show_bug.cgi?id=741050
EogWindow: remove the string matching from ui_settings_changed_cb

The changed setting is now passed as a detailed signal instead
of having to do string matching inside eog_window_ui_settings_changed_cb.
In order to facilitate this change, the connecting of the callbacks had
to be moved down a few lines to after the GActions are added to the window.

https://bugzilla.gnome.org/show_bug.cgi?id=741050
change action names to short, lowercase names

As the GAction documentation suggests, change the GAction
names to short, lowercase names.

https://bugzilla.gnome.org/show_bug.cgi?id=741050
Avoid endless feedback loop when changing bar visibility

Also provides feedback to the app menu when the sidebar is closed.