Not needed anymore after the general QML support got deactivated.

This reverts commit 74bd95d3.

To get QML functionality back, export QTCREATOR_WITH_QML before
running qmake

Reviewed-by: Kai Koehne

Reviewed-by: Kai Koehne

We already have it in the projects mode so we might as well
use the same in "Getting Started".

Reviewed-by: danimo

By popular request I added a "open project" option.
We don't currently have a way of differentiating project types
from other files so I had to hardcode .pro and .qmlproject
for now.

Themed icons was also added to the new and open buttons.

Reviewed-by: danimo
Task-number: QTCREATORBUG-1142

Reviewed-By: Jens Bache-Wiig

No need for scrolling after my last commit.

This reverts commit 577057d2.

to able to scroll long lists again.

Remove HTML-formatting and replace by properties set in constructor.
Use in forms.

instead of a tweaked QTreeWidget, making it twice as fast.
Acked-by: Daniel Molkentin <daniel.molkentin@nokia.com>
Rubber-stamped-by: Jens Bache-Wiig <jens.bache-wiig@nokia.com>

Got rid of the inner frame to make things look more
tab-like and less cluttered.

Done with Danimo. Most changes are cosmetic but we modified
the tutorial listing and re-arranged some of the layouts to
better reflect the suggestions by Ergosign and Nigel.

Looks more structured now.

Also move Designer::Internal::FormWindowEditor ->
Designer::FormWindowEditor.

This removes the all hard dependencies to and from welcome screen,
except the one to the core plugin. More in detail:

- Add IWelcomePage to add a tab to the welcome screen
- Move tabs in the modules where they belong
- Enables QHelpManager to open help fullscreen and contextually
- "Getting Started" moves to Qt4ProjectManager
- Projects & Sessions (aka "Develop") moves to ProjectExplorer
- "Community" remains in the welcome plugin for simplicity