* URLs no longer have to be passed
* watchdog for DB readers to check DB status
In same step:
* fixed some log messages and comments
* allow to self signed SSL certificates
* adjusted namespace for CNetworkUtils (now in network)
* renamed to connectDataReadSignal
* removed unused individual signals, e.g. vatsimMetarsRead -> replace by data read signal + entity flag
* added data in METAR class (kept there, not in airspace monitor) -> reader aware
* renamed files without "_"
* added flags
* integrated URL into global reader settings
* added new parameter for connectVatsimDataSignals
* removed unused setting in settings / network.h
