error happening at startup might not be displayed

if an error happens before the Qt vue is loaded it might not be displayed and get lost

The issue is that the dialogs view is loaded asynchronously and messages are queued on Qml side.

what I propose is to:

• create the model while opening the interface
• make it accessible (either through a global variable or expose it in the god object main interface instance)
• error messages should be stored within the model rather than on Qml side
• when initially loading the Dialog view, error messages should be displayed if there is any