Use user's xkb options

[lenemter]

Xkb options are responsible for "switch layout" shortcut, Compose key and Caps Lock behavior.

Requires elementary/settings-daemon#67

Fixes #541

[Marukesu]

i think we should use the InputSources property provided in the org.freedesktop.Accounts.User interface and remove the related keys in the pantehon and settings daemon interfaces (why we duplicate the keyboard layout info?).

[zeebok]

Maybe I am misunderstanding this PR or testing in VM is causing odd behavior, but the keyboard shortcuts such as compose key and switch layout do not work. At least when set to Caps Lock, that key's behavior remains default.

[lenemter]

@zeebok Make sure you installed settings-daemon from git. Also, there is some bug with git version, it no longer autostarts for me after installing, so launch it manually from terminal. Hope it will make it work for you

[zeebok]

Alright was able to test it correctly and confirm it works. Testing did reveal that if you have the Composer Key as Caps Lock, the alt+caps lock switch layout shortcut no longer works, but that is a bug for.... some other repo.

There is a conflict with master to fix, and the other comment from Marukesu to address, but this does work and look good.

[lenemter]

@Marukesu I think this is out of scope of this PR. Can you file a new issue about duplicating keyboard info? Also, where do you find about this InputSources in org.freedesktop.Accounts.User. I tried to google anything, but found nothing about this.