Add a script for GuiVM session

[pwmarcz]

See QubesOS/qubes-issues#5662.

Depends on a refactoring (and rpc service) in QubesOS/qubes-gui-agent-linux#105.

Also needs installation by Salt:

• set qvm-feature gui-allow-fullscreen = 1,
• add an xsession script /usr/share/xsessions/sys-gui.desktop:

[Desktop Entry]
Name=GUI Domain (sys-gui)
Exec=qubes-guivm-session sys-gui
Type=Application

[codecov]

Codecov Report

Merging #154 into master will increase coverage by 0.05%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #154      +/-   ##
==========================================
+ Coverage   74.09%   74.14%   +0.05%     
==========================================
  Files          49       49              
  Lines        6327     6328       +1     
==========================================
+ Hits         4688     4692       +4     
+ Misses       1639     1636       -3     

Impacted Files	Coverage Δ
qubesadmin/tools/qvm_start_daemon.py	53.70% <50.00%> (-1.42%)	⬇️
qubesadmin/tools/qvm_run.py	80.31% <0.00%> (+2.65%)	⬆️
qubesadmin/spinner.py	77.41% <0.00%> (+6.45%)	⬆️

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