The "Integration" project was not active anymore and got removed.

The virtual keyword got lost by accident during the implementation of the new instantiation framework. Custom classes want to be able to plug into the "Dispose" call of GObject.Object otherwise the custom "Dispose" would eventually not be executed if the method is marked with the "new" keyword.

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GObject.Object: Make "Dispose" method virtual again

Building on CI failed due to updated dotnet version which included a newer version of "dotnet format" command.

Fix code format

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GObject-2.0.Integration: Support global namespace

This fixes #1196

Allow NULL parent window in async dialog functions

The source analyzer supports user in finding the correct way to use the generated code.

Interfaces can only be implemented by GObject classes not records. Every class inherits from GObject.Object which implements IDisposable. So implementing IDisposable on interfaces is possible.

In case of GirCore every instance of an object has a native counterpart. As the dotnet runtime does not know how big this native counterpart is the user should be able to explicitly dispose all instances which is easier if IDisposable is available on interfaces.

Fixes: #1202

Interfaces should implement IDisposable