Systemd service updating (#240)

* Add services and updated installer files

* Loader updates service file during update!

* Testing update branch doesn't exist lol

* Update to dfl 3.7.12

* Fix services and add working service updater

* Revert services but replace their aliases

* Fix install scripts as well

* Move leftover service files to .systemd dir

* No wonder it's not trimming the file...

* fix whitespace

* Remove unused imports

* Remove another un-used import

Co-authored-by: AAGaming <aa@mail.catvibers.me>

dist/plugin_loader-prerelease.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=SteamDeck Plugin Loader
+After=network-online.target
+Wants=network-online.target
+[Service]
+Type=simple
+User=root
+Restart=always
+ExecStart=${HOMEBREW_FOLDER}/services/PluginLoader
+WorkingDirectory=${HOMEBREW_FOLDER}/services
+Environment=PLUGIN_PATH=${HOMEBREW_FOLDER}/plugins
+Environment=LOG_LEVEL=DEBUG
+[Install]
+WantedBy=multi-user.target