Task-Nr: QTCREATORBUG-2269

Switch to Edit Mode once we constructed it in Core::init(). Switch to a
the Welcome Mode in Core::extensionsInitialized. Also works

The function always switched to Edit Mode, which was the cause for
several bugs. Since openEditor() already does switch to the right mode,
the function is not really needed.

The following actions now respect the prefered mode of the editor:
"f file"-locator
The Open Documents list
Editor history navigation

It was missed by the remote adapter before.

 * Properly handle additional information text without
   file information by appending it to the previous task.

This way we have a chance to flush out any state the parsers
might have.

Reviewed-by: Friedemann Kleint

Unfortunately, we still have a few ILocatorFilter based classes that
don't play nice with threads.

Fixes a regression.

Doc - Add information about the Open Type Hierarchy function, and the functions for moving to symbol definitions and declarations.

Reviewed-by: Leandro Melo

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

following suggestions. Introduce argument syntax in XML allowing for
fine-grained control of handling (omitting empty values, use
temporary files).

Reviewed-by: Friedemann Kleint

Fix QObject::connect warning about incompatible sender/receiver
arguments

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

Reviewed-by: dt

Try to make the observer mode less intrusive by removing the toolbar,
and making the crumblepath only when mode is active / an overlay.

Task-number: QTCREATORBUG-1893
Reviewed-by: Daniel Molkentin

Task-number: QTCREATORBUG-2248

On that occasion, rename Designer to show up as 'Form Editor'
instead of Xml Editor in 'Open With'.

Task-number: QTCREATORBUG-2246

identifiers.

QString::isNull() vs. isEmpty() discrimination is a time bomb ...