performance: avoid unnecessary writes to oxconfigdisplay in case noth…

…ing has changed

+ do not import/export theme configuration of not active themes
+ remove performance optimization that compares config value with the stored value to avoid unnecessary writes because that is now handled in oxid console
+ warn on export if config values are in theme and in general namespace and optionally fix it ( because that values in general namesapace may cause trouble and are useless in the export because the, normally they should be overwritten by the theme config anyway)

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog for Config Importer
 
+## 4.0.12 
+* performance
+* theme config handling (do not include unnecessary config)
+
 ## 4.0.12
 * performance
 * fix to be compatible with new oxid console