CMetarSet was implemented as a collection. This only makes sense for
values which have one member variable only or hardly ever change. METARs
often change and therefore a collection didn't make much sense.
Additional profiling showed that a sequence has better algorithmic
performance.
refs #689
Instead of enabling fast position updates via context methods, the
settings API will be used instead. This also allowed to move the timer
into CNetworkVatlib instead of CAirspaceMonitor. The only necessary thing
was to regularly update the receiver callsign set.
refs #677
* New hint flag: DB data for the client will no longer be web loaded but fetched from cache whenever possible
* No public constructors for the 2 classes
* adjusted main
The following issues were fixed
* Fixed wrong/missing namespaces
* Fixed obvious typos in documentation
* Documentation not in sync with source code
refs #544
* new slot syntax in ATC station component
* formatting, comments
* tab order
* utility function for severity in status message
* null checks in threadutils
* invalidKey function in datastore
* changed data object keys (cached objets)
* added missing value object compare cases
* renamed timer in context network
* finder function for model list
* renamed getContainer to container (as it is just a reference)
