Since Actions like copy/paste and delete interfiere
with controls like LineEdit, I added a special context
for the form editor. Now copy/paste/delete on the Qml items
are only registered for the form editor context and copying the contens
of a LineEdit will not lead to copy an item instead, anymore.

Reviewed-by: Kai Koehne

Bauhaus now uses only one single instance view.

Done by Marco Bubke

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

When changing the language, the sidebar items would break because
their localized window titles were used for storing the settings. Now,
id's are used.

Reviewed-by: con

SideBar was patched to give it extra functionality:
 - closeWhenEmpty: when all sidebar widgets are closed, the whole
   sidebar will disappear, too.
 - unavailableItems: a list of non-openable windowTitles can be given
   to the sidebar.

Reviewed-by: con

Alt+0 does this now, the command is overridden.

Reviewed-by: kkoehne

QtCreator crashed on exit when the library/navigator/sidebar wasn't
visible in the Design mode. This is caused by a double deletion: The
widgets have the DesignModeWidget as the default parent + the side bar
items try to delete them on exit.

Fixed by removing default parent.

Task-number: QTCREATORBUG-1197
Reviewed-by: Christiaan Janssen

Reviewed-by: thomas hartmann

Task-number: BAUHAUS-565
Reviewed-by:erikv

Reviewed-by: Thomas Hartmann

Make DesignModeWidget::showEditor reentrant save by explicitly checking
the current status.

The crash happens only reproducably when debugging creator inside
creator (gdb-7.0-ubuntu!).

Reviewed-by: Lasse Holmstedt

QML Designer now listens to contextChanged signal instead of
modeChanged and checks that the context is same as that of qmldesigner.

Reviewed-by: con

Reviewed-by: kkoehne

Task-number: BAUHAUS-451
Reviewed-by: kkoehne

People will only see the default widget while Bauhaus initializes

Moved Qt Designer to open from Design Mode. Also, Design mode is now global,
and created in coreplugin. Other plugins can register themselves to it.

thus fixing the exit warning:
"~QX11PixmapData(): QPixmap objects must be destroyed..."

Acked-by: con

Just use high level TextEditor::gotoLine instead of directly manipulating
the QTextCursor.

Task-number: BAUHAUS-326

If the qml contains an error on frist call of
DesignDocumentController::loadMaster, we did not wire up the components
to the model. If the user then fixed the qml, the Design mode widgets
were 'enabled', but didn't contain any meaningful input.

Fixed by always wiring up the components. Unfortunately this shows the
'default' model with just a Rectangle.

Disable the states editor widget if the qml file is invalid, just
as the other windows are disabled.

Task-number: BAUHAUS-272