Start redesign of gedit
Use auto in the setting for notebook tabs
Integrate sidebar insto titlebar
Mark headerbars as titlebars.

See that we need custom css to remove the extra borders we have now
Show the right title for the sidebar headerbar
Move save button to the right
Add get_gear_menu to window and menu extension points
Port snippets to new menu api
Port docinfo to new menu api
Port Sort plugin to new menu api
Port Time plugin to new menu api
Port spell plugin to new menu api

This needs to be checked and tested with a proper installation
Port external tools to new menu api
Load custom css file
Dynanically add/remove gedit-titlebar-right css style
Remove uneeded tab border
Add bindings for alt+# keys
Update settings code to the new gaction stuff
Move setting to show the status bar to the prefs dialog
Restore per-window handling of panes