Code refactoring and removal of factory_widget attribute.

Code refactoring and removal of factory_widget attribute.

[Issue#] N/A
[Bug] KW comments, spelling mistake in table name. Unused factory_widget property.
[Cause] N/A
[Solution] Removed KW comments, renamed table from SettignsList to SettingsList, removed factory_widget and related methods, error codes, exceptions.
[Verification] 	1. Verification of renaming SettingsList - build wrt-extra with no errors.
 		2. Verification of factory_widget - build and run DAO tests.

Change-Id: I1b8bfba88cf494e1131dec9da26a7ba6270b6e69