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Task-Nr: QTCREATORBUG-4883

As of Qt 4.8 the observer and jsdebugger services are part of Qt. This
means the following changes are necessary in Qt Creator:

* Do not link to the QmlJSDebugger library.
* Do not create JSDebuggerAgent and QDeclarativeViewObserver instances
  in the QmlApplicationViewer and use the new declarative_debug CONFIG
  option to enable those services in Qt. This is done automatically
  for debug builds.
* Point out the QML Debugging Library and the QML Observer are "Not
  needed" in the Qt options page.
* Change the label in qmake options from "Link QML debugging library" to
  "Enable QML debugging". It still remains as a way to enable this
  functionality in release builds or for QtQuick applications not based
  on Qt Creator's template.
* Rely on qmlviewer for debugging QML UI projects rather than the
  observer, which is no longer necessary.

Reviewed-by: Kai Koehne

Split up target specific code into subclasses. Also change
Qt4BuildConfiguration to allow a null qtversion.

Remove code that relied on always having a qt version.
Also make it possible to remove all qt versions.

Completly change the qt in path autodetection to be only
a fall back if no configuration was found.

Note: For now the old settings are not removed, as such 2.2 and master
can coexist.

Reviewed-By: hunger

Change-Id: I8b73d583be1ee7183f4074bce49d5390e38631a2

Update the invalid icon of a Qt veriosn when applying changes.

Task-number: QTCREATORBUG-4647

Fix update of Qt debugging helper display (yet again;-)

Task-number: QTCREATORBUG-2810

Update the invalid icon of the Qt version as soon as the qmake path
is changed.

Task-number: QTCREATORBUG-4408

Allow slots that use the error ouput, but aren't interested in the list
of the tools.

Reviewed-by: dt

Always disable debugging helper details by disableing them as soon
as the Qt version is invalidated and make sure they get reenabled
again once the Qt version is valid again.

Task-number: QTCREATORBUG-2810

Add a button to remove all invalid Qt versions.

Task-number: QTCREATORBUG-3969

Task-number: QTCREATORBUG-4176

Introduce verbose flag and display QtVersion tooltip on
checkbox.

Reviewed-by: dt

Because qt might be invalid due to the s60 paths being wrong.
Ensure the paths edits are only shown fro s60 versions.

Reviewed-by: Kai Köhne <kai.koehne@nokia.com>

Remove S60devices and all the code surrounding it. This gets rid of
the S60 devices tab in the options dialog, too.

Tasknumber: QTCREATORBUG-3681
Reviewed-by: dt

Remove S60devices and all the code surrounding it. This gets rid of
the S60 devices tab in the options dialog, too.

Tasknumber: QTCREATORBUG-3681

We decided to have text-based buttons by default.

Avoid confusion with other debugging helpers.

Reported on mailing list

Reviewed-By: Tobias Hunger

Existing Directory checks for whether the directory exists, which
Directory does not. Also changes all existing PathChoosers from
Directory to ExistingDirectory as that does not change behaviour.

Refactor ToolChains in Qt Creator:

 * Allow for several toolchains of the same type
 * Be smarter wrt. guessing what kind of output a toolchain
   produces. This allows us to eventually handle e.g. embedded
   linux setups way better than before.
 * Be smarter wrt. guessing what kind of environment a Qt version
   needs.
 * Improve auto-detection of toolchains a bit
 * Decide on which debugger to use based on the kind of output
   produced by the compiler.
 * Add options page to configure toolchains
 * Remove toolchain related options from the Qt version dialog

Reviewed-by: dt

Reviewed-by: dt

This fixes the case that the user only compiles one debugging helper, and
the debug output was displayed although the compilation went fine.

Task-number: QTCREATORBUG-3711
Reviewed-by: ckamm