[bug#35305] [WIP] LightDM service

[L p R n d n]

Hello,

Wanted to work on Guix's website but fate led me to try my way on a
lightdm service...
So, here is what I got for now.
It fails to start a window manager but I don't think I'll be able to
debug the last mile with my sole knowledge.

Beside that, here is a list of possible improvements before merging:

* lightdm-greeter-gtk configuration is a part of lightdm's service.
It might be a good idea to give it its own service but it would
mean we need to write a service for each lightdm greeter.

* lightdm complains about the lack of
  org.freedesktop.DisplayManager.AccountsService interface.
  The lightdm package provides the relevent files but it seems
  accountsservice doesn't find them. I think it searches them in
  $XDG_DATA_DIRS/accountservices . See
  https://github.com/NixOS/nixpkgs/issues/45059

* lightdm-gtk-greeter's wrapper is handmade and ugly.

* General refining.

A thorough review would also be welcome as I'm not really sure I know
what I'm doing.

Thanks!

L  p R n  d n

0001-gnu-lightdm-Update-1.28.0.patch
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0002-gnu-lightdm-Add-vala-bindings.patch
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0003-gnu-lightdm-Re-enable-all-tests.patch
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0004-gnu-lightdm-gtk-greeter-Update-to-2.0.6.patch
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0005-gnu-lightdm-gtk-greeter-Fix-at-spi-runtime-dependenc.patch
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0006-gnu-lightdm-gtk-greeter-Fix-.desktop-file.patch
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0007-gnu-lightdm-gtk-greeter-Wrap-binary.patch
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0008-gnu-lightdm-Build-accountsservice-files.patch
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0009-gnu-lightdm-gtk-greeter-Fix-some-warnings.patch
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0010-services-Add-lightDM-service.patch
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