Fix settings loader

Remove all class vars for vars that are only used in the loader itsef
- entry_split_char
- entry_convert
- entry_set_empty

The self.settings varr was never used, removed

The config file path exists check is moved to the config data loader

The internal _check_settings_abort is now __check_settings_abort to make it private

lock file updates

test-run/config_handling/config/settings.ini

@@ -27,3 +27,7 @@ element_c=True
 email=foo@bar.com,other+bar-fee@domain-com.cp,
 email_not_mandatory=
 email_bad=gii@bar.com
+
+[LoadTest]
+a.b.c=foo
+d:e:f=bar

test-run/config_handling/settings_loader.py

@@ -113,6 +113,13 @@ def main():
     except ValueError as e:
         print(f"Could not load settings: {e}")
 
+    try:
+        config_load = 'LoadTest'
+        config_data = sl.load_settings(config_load, {})
+        print(f"[{config_load}] Load: {config_load} -> {dump_data(config_data)}")
+    except ValueError as e:
+        print(f"Could not load settings: {e}")
+
 
 if __name__ == "__main__":
     main()