Discussion: Auto-enable systemd user service across all distros

[gonX]

Having this would also require packaging a blacklist file that disables autoloading of the wacom and hid_uclogic modules.

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Arguments for having an auto-enabling systemd user service:

• Stuff should just work (on a properly configured system)

Arguments against:

• Limited compatibility (we need DISPLAY/WAYLAND_DISPLAY env vars to start at all), see Rewrite "X11/Wayland Session not detected" in Linux FAQ OpenTabletDriver.Web#43, maybe discuss whether OpenTabletDriver should just guess if vars are not present?

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Originally I was opposed to this on Arch since I was under the impression there is no precedent for doing this. However, while switching between Wireplumber and Pipewire Media Session, I noticed that user services were automatically being enabled. If it's possible to get the env var behavior more consistent we can more safely do this.

[hwsmm]

DEB/RPM already disables these modules, and (I tried) enabling systemd services automatically with #4, but it didn't work reliably so I am now trying to disable it through #24

It seems Arch PKGBUILDs are using --global, but I think enabling the service is unnecessary since launch scripts in this repo already starts service if it's not available so...