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

Sorting according to severity then id

Reviewed-By: hunger

Use signals from buildsteplist to add/remove/move a buildstep in the
UI.

Reviewed-by: dt

Reported on irc by ckamm

Task-number: QTCREATORBUG-4771

Change-Id: I8b73d583be1ee7183f4074bce49d5390e38631a2

Task-number: QTCREATORBUG-3822

Task-number: QTCREATORBUG-4690

Task-number: QTCREATORBUG-4531

If the user has enabled "Reload unmodified" then on remove the
unmodified editors are closed. Otherwise the user is asked as before.
Also modify the message to indicate if the change was triggred
externally.

It was starting X11 and a xterm...

Task-number: QTCREATORBUG-4683

Set up UI elements before they are used. No crash since the elements
are guarded by QTC_ASSERTs, but annoying output.
(cherry picked from commit 1df46042)

Broke with IContext refactoring.

Moving the implementation to core plugin.

Removes the dependencies to project explorer and text editor plugins
and moves unrelated code to its own file.

Task-Nr: QTCREATORBUG-4545

Work around QTBUG-17529 by normalizing the capitalization of the
working directory (which we do already for launching apps without
debugging).

Task-number: QTCREATORBUG-4592
Reviewed-by: Friedemann Kleint

Task-Nr: QTCREATORBUG-4579

Reviewed-By: hunger

Proper termination.

... on 64bit platforms.

Try to start debug listener if it is not yet running. This can
happen when e.g. a external debug listener was closed in the
meantime.

Task-number: QTCREATORBUG-4589

Get debug output for all GUI applications at once. This should
stop the "Cannot retrieve debugging output".

Task-number: QTCREATORBUG-4569

We ship a precompiled qmldump in the Qt SDK because the Qt versions
don't have private headers. However, the logic in buildablehelperlibrary
by default rejects any build that is older than the latest changes to the
qmldump source code files; allow Qt Creator to pick up the (maybe
outdated) qmldump nevertheless if no private headers are installed.

Reviewed-by: ckamm
Task-number: QTCREATORBUG-4578

lots of use of Utils::FileSaver and Utils::FileReader

Task-number: QTCREATORBUG-1619

it doesn't change the emitting object