elisp: add window stickiness

Add a toggle to change window stickiness with a buffer, aka window
dedication.
The sticky state is toggled with "C-c *".

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
elisp: my-dired regroups all dired related elisp

Transfer all dired setups into my-dired.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
elisp: work: intel: device-control-barebox guessing

For device names guesses, discover the tty devices of barebox connected
devices, or use "last" as the last connected barebox.

The barebox commander should be amended accordingly.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
site-elisp: fix submodules

Use https://github instead of git@github to be free of ssh keys.
As the same time:
 - update device-control
 - update gnus

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>