* Update to sommelier from platform2 with graphics hardware acceleration support

* Cleanups of ARCH variables & formatting

* Add more documentation

* cleanup default drivers and paths

* Shared Memory Drivers w/o crostini need to be noop

* Cleanup formatting and fix library paths for non-x86_64 archs

* Refactored with hashcheck, & new const

* s/armv11/armv7l/

* depends cleanup

* Update to current c++ version of sommelier

Also add startsommelier & restartsommelier scripts as per 
https://github.com/skycocker/chromebrew/pull/4517

* Add xdpyinfo as dep as part of .bashrc script

* Use more flags used in crostini

* Display should be a variable

* refactor sommelier variables to not source scripts

As pe https://chromium.googlesource.com/chromiumos/docs/+/master/security/noexec_shell_scripts.md

* needs xauth; log to /tmp/sommelier.log

--sd-notify=READY=1 does not work.

* adjust sommelier run time flags & env file documentation

* Refactored scripts

Also now have both sommelier instances running correctly,
for both wayland & xwayland.

* eliminate need to use sed on source files

Just put virtwl.h in build/linux!

* wayland sommelier instance needs display setting

* Have all X instances run through sommelier proxied wayland

* cleanups of env var code

* Use "-L" with curl

* eliminate variable in .sommelier.env

* conditional dependency to allow for xwayland package

* Changed logfile location

* edit postinstall text

* Add xwayland tweaked for sommelier

* Add xwayland dependency.

(This can be removed if a later version of xorg_server incorporates the xwayland changes.)

* remove xauth flag, more extensive xserver cleanup

* use XDG_RUNTIME_DIR in cleanup

* Fix variable name

* fix array variable assignment in .sommelier.env

* Adjust sommelier_accelerators variable

* escape line continue \

* Don't export temporary variables

* Refactor scripts to indepedently start/stop sommelier instances

* Make suggested changes, fix gcc >9.x error.

* clean up patch infrastructure

* change download semantics as requested

* Fix missing "d"

* make checksommelierwayland fn more robust