Reduce SpoolBuddy kiosk CPU/memory pressure

Add Chromium flags to cut overhead on Pi: disable extensions, crash
  reporter, background timer throttling, renderer backgrounding, and cap
  V8 heap at 128MB. Mask (not just disable) stripped system services to
  prevent socket/dbus reactivation, and add xdg-permission-store to the
  disable list. Remove chromium and upower from strip_packages since the
  kiosk needs them — they were being uninstalled then immediately
  reinstalled on every run.

spoolbuddy/install/install.sh

@@ -897,11 +897,6 @@ strip_packages() {
         cups-common
         cups-client
         rpcbind
-        upower
-        # Replaced by cog (WPE WebKit) for kiosk
-        chromium
-        chromium-common
-        chromium-sandbox
     )
 
     local to_remove=()