Change how the "local/network" setting is handled to address some issues.

Move local/network setting datetime convert into it's own function.
Function parse_date_time() now returns when possible a correct timezone aware datetime.
Change webapi to use new converter.
Fix Daily Searcher.
Fix saving old DateTime setting.
Add safety check if network_dict is already loaded.
Merge pull request #150 from Prinz23/feature/ChangeShowNetworkSettingHandler

Change how the "local/network" setting is handled to address some issues...