QDS needs quick preview method, addtion to "live preview" of project wide level.

Several customers(GAC, Dessay SV..) report that QDS doesn't have convience preview method which KANZI studio has.

Scenario description as following:

1. Animation designer want to view the result immediatly. After modifying animation configuration within timeline editor, the designer want to preview the change. Currently they have to grab the "current time bar" then move mouse to simulate time flow manually. Since the "play" pushbutton aka live preview function will start the whole application which is too complex. Image that the designer may only responsible to one page while the project is unfinished and one even can't jump to the target page using live preview.
Suggest to add a “quick play” pushbuttom, to let the animation play within the editor. Manually drag the "current time bar" can't have accurate speed.

2. The "Project manager" should provide a live, animated preview widget. In the Editor & Design model, it shows all project files in a tree view. User report that it's difficult to find out required component(qml file) only according to its name. They want to have a preview widget for each selected qml/resource file. Nice to have animation or states preview in loop.