Link now caches imports. That means importing the same library (say, Qt)
from more than one file no longer creates an importing namespace for
each one. Instead, a single one is created for the instance of Link.

To make this work, the type environment in ScopeChain has been given its
own type: Interpreter::TypeEnvironment. That has the added benefit of
being able to carry meta-information about imports. You can use
TypeEnvironment::importInfo(qmlComponentName) to get information about
the import node that caused the import of the component.

Rename 'QML standalone application' to 'QML application'
and the 'old-style' QML applications to
'QML Viewer based applications'.

For the QML renaming:
Rubber-stamped-by: Alessandro Portale <alessandro.portale@nokia.com>

This should make it easier to debug problems with Qml plugin type
dumping.

Reviewed-by: Roberto Raggi

Also introduce a indirection, modes have now types, edit and debug have
the same type, and editors do have a prefered type of modes instead of a
prefered mode.

That fixes the bug that if the prefered qml editing mode was set to
design, then in switching between qml editors would
- in Edit Mode: stay in edit mode
- in Debug Mode: switch to debug mode

Check in advance whether position is still valid. This can be false if
the text has already changed, but the outline hasn't been yet updated.

Make sure all internal hashes for an item are initialized before
inserting it into the tree.

This affects how files are identified by the MIME database.
Although this is a general improvement, it was triggered by the following bug report.

Task-number: QTCREATORBUG-1793
Reviewed-by: Friedemann Kleint

Reviewed by: Lasse Holmstedt

Reviewed-by: Roberto Raggi

The wizards already provide a default suffix for file creation.
But since the user is still free to specify something else it's better to leave it to Creator to decide which one is the proper editor.
After all, this reflects how the file will be treated by Creator (including the next time it's opened).

Task-number: QTCREATORBUG-2006

The delay was increased to 500 ms and the marker only
appears now, if the cursor is directly on the type name.

This way the text marker creates less visual noise.

Task-number: QTCREATORBUG-2285
Reviewed-by: Roberto Raggi

Task-number: QTCREATORBUG-2295

Reviewed-by: Christian Kamm

Fixes a regression.

Hopefully fixes crash when opening a .qml file from the command line
(mac os x).

Select parent element if the property isn't shown in outline (due to
filter).

If we stay inside the node we keep the text marker

Initialize e.g. m_itemToNode before the view calls back to the model.

Reviewed-by: Roberto Raggi

It's used very often, so lazy computation (potentially in the gui
thread) was too expensive.

Reviewed-by: Kai Koehne

updateUses() has to be called for cursor position changes.

Done-with: Kai Koehne

 * Fix all warnings about non-explicit constructors except for those
   in 3rdparty code.

updateUses() is already called after each text change.

* If possible, create LookupContexts through SemanticInfo; it caches the
  linked Context and will be faster.
* Contexts now own their Engine.

Reviewed-by: Lasse Holmstedt