lookandfeel: Keyboard layout switcher
shell: Don't hardcode applet configuration sidebar size
shell: Add applet alternatives dialog
notifications: Rename to Notification Center

Otherwise it gets confused with the Plasma version.
appchooser: Add a method to run an arbitrary kcm
shell: Run kcms from control center

We don't have UI to configure things like clock and regional settings
so we fall back to kcms.
shell: Configure system tray

Add our notifications center to the system tray and remove klipper.
In the future we'll add our custom version of other applets.
lookandfeel: Load custom items from the login screen

LoginScreen is shared between lockscreen and loginmanager and they need
different icons below the password field.

Add a Component property to LoginScreen and a Loader so that the additional
action buttons can be customized.
lookandfeel: Add keyboard layout switcher to the lock screen
lookandfeel: Add keyboard layout switcher to the login manager

Create a component to switch keyboard layouts for the login manager.
This will look like the one for the screen locker.
lookandfeel: Add session selector to the login manager

Replace view with a combo box.
lookandfeel: Use avatar-default-symbolic by default

Pick a default icon for the lock screen greeter.
lookandfeel: Move new session and user switcher buttons to lockscreen
lookandfeel: Remove leftovers