id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
12925	Move main window management to new class	michael2402	team	"Create a new Class `MainFrame` for the main window, move code from `Main` and `MapView` there.

This class should do:
- The title management
- Basic geometry setup
- Automatically display the start screen as long as no layers are present.
- Do all MapFrame handling

Long term goals:
- Remove Main.gettingStarted
- Do not destroy the MapFrame if all layers are removed - keep an empty layer list. This would remove many Main.map == null checks and prevent problems for missing checks.

We should get away from the concept that the UI will always be structured the way it is now.

Patches: #12927"	enhancement	new	normal		Core			gsoc-core	Don-vip bastiK stoecker