Qt Installer UI improvements

Business justification:

Qt Installer will be one of the first things, which Qt newcomers run into, when they start using Qt. The installer should look nice and provide such a user experience that new users find installation effortless, while experienced users can quickly choose the components need. Good installer UI is one part, which makes evaluators think Qt is an excellent framework to start creating products and this experience would bring us more customers. On the other hand, our existing customers should feel our tooling, including the installer, are efficient and easy to use that they do not start considering using competitive solutions. 

Description:

There is a continuous demand to simplify Qt Installer UI, while at the same time adding new components, new versions, new patch releases, and change the component hierarchy. There are two main goals: provide Qt users an effortless and efficient installation experience and handle the changes in a manageable way. 

Some UI related issues to be improved:

• What is the overall UI structure of the installer? What is both easy and intuitive for newcomers but efficient and nice for experience users?
• What is the best way to show the UI hierarchy? How the hierarchy should map to our product structure? How to show different product add-ons so that they are easy to find?
• What is the best way to show preview components in the installer?
• How patch releases should be shown? The benefit of the current approach, where all patch releases are visible, is that it's easy to revert to a previous release. 

Effort estimate:

• 8 person months