Add a new project type : attached mode

[DorianBDev]

Description

This adds a new project type that allows skipping the import phase when creating a new project. It uses a new dynamic image loading and rendering system. This should allow Degate to support images with billions of pixels in each dimension.

Affected area(s)

• [x] Core
• [x] GUI
• [x] Tests

Changes type

• [ ] Bug fix
• [ ] Migration
• [x] New feature
• [x] Feature rework

Proposed changes

• Add a new project type.
• Rework TileCache system.
• General optimization.

[DorianBDev]

Definitely not production ready.

[DorianBDev]

It should be almost production ready, but not battle tested. Please see this for more information.

[DorianBDev]

Fixed all reported bugs.

[DorianBDev]

Need to show a warning notice when selection the new project type. This should also be shown with a special beta label in the project setup dialog. Some more tests are also needed before landing this in next alpha/beta of Degate (ETA: September).