* 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)
* changed aircraft view to siumlated aircraft models / views
* functionality to change fast pos. updates (signals, slots)
* allow to request text message widget from aircraft component
* Allow to "jump" to text message channel from ATC / aircraft
* changed timer connections for components to new SLOT syntax
* housekeeping:
** new function in network context for station by callsign
** refactored textmessage component, allow to select tab by slot
** wired up signal / slots in main GUI
** removed unused functions
** allow to select area and "myself" in infoarea
* preparation for a context menu to send text messages from ATC/aircraft view
* preparation for context menu for fast pos. updates
* reverse ICAO lookup at login screen
* display fast updates / parts in GUI
* moved max- aircraft into settings
* made serverselection own component
* added functions in component to select COM frequencies
* changed views to contain ObjectType in template
* function to obtain selected objects in view base class
* the term "components" will only be used for GUI components (derived from QWidget/ QWidget derived classes) fron now on
* timer, and enabler classes renamed accordingly: CEnableForRuntime, CEnableForDockWidgetInfoArea, CUpdateTimer
* adjusted all dependent classes
* discussion: https://dev.vatsim-germany.org/boards/22/topics/2027?r=2040#message-2040
* fixed bug with ATC station component, wrong signals for booked stations
* booked stations loading to frequently (for each minor change such as online), changed to timestamp based concept
* update booked stations with receiving ATIS/voiceroom to online
* CDigestSignal class: new class and methods for collecting signals, avoiding too many signals - one of the cures for the performance issues
* fixed bug found during testing, missing start for timers when connecting to network
