Properly fix intermittent installation failures

Instead of setting addon variables to None (which causes issues),
fix the root cause by removing unnecessary module-level initialization:

- Remove module-level user_details loading in functions.py
- Load user_details locally in functions where actually needed
- Wrap remaining module-level addon access in try/except in:
  - service.py (log_timing_data)
  - default.py (log_timing_data)
  - kodi_utils.py (addon variable)
  - functions.py (__addon__ and related variables)

This prevents crashes during installation/update while avoiding
None-related issues during normal operation.

default.py

@@ -8,10 +8,14 @@ from resources.lib.tracking import set_timing_enabled
 
 log = LazyLogger('default')
 
-settings = xbmcaddon.Addon()
-log_timing_data = settings.getSetting('log_timing') == "true"
-if log_timing_data:
-    set_timing_enabled(True)
+try:
+    settings = xbmcaddon.Addon()
+    log_timing_data = settings.getSetting('log_timing') == "true"
+    if log_timing_data:
+        set_timing_enabled(True)
+except Exception:
+    # During installation/update, addon might not be fully registered yet
+    pass
 
 log.debug("About to enter mainEntryPoint()")