Fixes: - react on build/ run configuration changes
       - now notices environment changes, like switching Qt versions
       - start button is now only shown if we have a valid qemu runtime
       - enabled/ disabled state works properly when loading a project

Task-number: QTCREATOR-210, QTCREATORBUG-1252, QTCREATORBUG-1082
Reviewed-by: ck

Task-Nr: QTCREATORBUG-1164

Reviewed-by: kh1

Reviewed-by: kh1

Reviewed-by: kh1

Reviewed-by: kh1

Reviewed-by: kh1

Reviewed-by: kh1

Fixes broken enabled/ disabled qemu start button behavior.

And refuse to add it twice. The check is pretty simplistic in that it
doesn't take scopes or which variable it's exactly in into account.
But in those cases you need to edit the .pro file manually anyway.

Task-Nr: QTCREATORBUG-932
Task-Nr: QTCREATORBUG-891
Task-Nr: QTCREATORBUG-653

That is e.g. SOURCES instead of whatever variable is used first in the
project file.

Reviewed-By: ossi

Fixes broken enabled/ disabled qemu start button behavior.

Task-Nr: QTCREATORBUG-765

Quick fix by copying code also found in Qt4 and QML project managers.
Would be better to have some common solution...

Task-number: QTCREATORBUG-1383

Reviewed-by: ossi

Reviewed-by: Leena Miettinen

Reviewed-By: con
Reviewed-By: Friedemann Kleint

We now support renaming files. The version control system tries first to
rename, if that doesn't support or can't rename the file we do a normal
rename. (Note: git, hg, perforce > 2009.02 support renaming, cvs not.
(perforce untested)). We correctly notify all editors of the renamed
file and tell the project manager to rename the file in the project.

Note: Only the qt4projectmanager knows how to rename files.

Note: renaming folders, moving files to different folders, renaming
.pro/.pri files is not supported. Those things can be later added after
this has proven to work correctly in the simple case.

Also we don't do any actions based on the renaming like renaming
classes, changing include guards or #include lines.

The symbian makefile generator don't support shadow builds. Thus they
always pollute the source directory with build artefacts. Mixing
in-source and shadow builds is obviously broken.

We do as good as we can, setting OBJECTS_DIR, MOC_DIR, UI_DIR, RCC_DIR
to .obj, .moc, .ui and .rcc, which keeps the source dir clean of at least
some of the artefacts. This is as good as we can, but not really good.

Task-Nr: QTCREATORBUG-1293
(cherry picked from commit 33ef722b)

The symbian makefile generator don't support shadow builds. Thus they
always pollute the source directory with build artefacts. Mixing
in-source and shadow builds is obviously broken.

We do as good as we can, setting OBJECTS_DIR, MOC_DIR, UI_DIR, RCC_DIR
to .obj, .moc, .ui and .rcc, which keeps the source dir clean of at least
some of the artefacts. This is as good as we can, but not really good.

Task-Nr: QTCREATORBUG-1293

Symbian mkspec puts the package file into the build directory,
not the destination directory.

Task-number: QTCREATORBUG-1341

Reviewed-by: hjk