Qt5 obsoletes global typedef qInstallMsgHandler and QtMsgHandler

Using qInstallMessageHander and QtMessageHandler
QtMessageHandler has a different signature than QtMsgHandler providing
information about context. Incorporated that information in the vtkOutputWindow
message printout.

Change-Id: I2c0b9fac88ee2dd28b08d1108654b1983fb7b0fe
QAbstractItemModel::reset() and QAbstractItemModel::createIndex

QAbstractItemModel::reset -
The deprecated function emitted two signals, namely modelAboutToBeReset and
modelReset. Using beginResetModel and endResetModel to emit these signals
instead.

QAbstractItemModel::createIndex -
Ambiguity when compiling with gcc.
When the last parameter is either NULL or 0, GCC fails to resolve
which path to follow. Use the default value (void* ptr = 0) provided in the
function declaration.

Change-Id: I6df26e314bbff6522dab8cd48d328b8b065d91b8
Compile flags (-fPIE) for position independent code

Qt5 is built and packaged with the -reduce-relocations configure option as
default. This causes compilations to run with the -Bsymbolic-functions option,
which makes function pointer comparison ineffective, unless the -fPIE flag is
also supplied.

Change-Id: I61d13993e0cc6fee2e38e8a124e32459f6203d40
Qt5 obsoletes toAscii and fromAscii methods

Replaced all instances:
QString::toAscii --> QString::toLatin1
QString::fromAscii --> QString::fromLatin1
QChar::fromAscii --> QLatin1Char

Change-Id: Ic4f9c5316c73a305ded835e02fc3ff6babffdf39
Multiple Qt5 related minor changes

1. QCursor constructor needs QPixmap instead of const char*
2. Qt::WFlags obsoleted. Replaced by Qt::WindowFlags
3. QPixmap::serialNumber() deprecated. Replaced by QPixmap::cacheKey()
4. QVariant(Qt::GlobalColor) is now private. Use QVariant(QColor(Qt::GlobalColor)) instead.
5. QMetaMethod::signature obsoleted. Replaced by QMetaMethod::methodSignature().
   To avoid runtime issues get the pointer to data using methodSignature().constData()
6. QDir::convertSeparators obsoleted. Replaced by
   toNativeSeparators/fromNativeSeparators
7. QRegion::unite deprecated. Replaced by QRegion::united
8. QCoreApplication::UnicodeUTF8 is deprecated.
9. Missing includes

Change-Id: I44861d866aa2b2b5cb339b620c120a0c075ffd55
Obsoleted constructor for QGraphicsItem

Removed the use of QGraphicsScene from the constructor argument.

Change-Id: I696417dc65db7b978ab35ae07a8f4d4e5b18c640
QtGui library -> include QtGui/* files directly

Change-Id: If348023b9caec26b63c69e257516fb89d494ec08
QWindowsStyle and QPlastiqueStyle obsoleted

Replaced with the Fusion style and the new QStyleFactory::create() API.
Use style depending on Qt version used

Change-Id: Icc89344182f76c07af93600308afac7762ff52ed
Find Qt5 modules for plugins

Change-Id: I104bcf927c74c5f84b975f8d5c0df9f3964a9064
Use the new Qt5 plugin architecture

Q_EXPORT_PLUGIN2 deprecated. Replaced by Q_PLUGIN_METADATA
Find the Qt5 RCC executable to generate qrc_* files.

Change-Id: I86e6664e85015e3817d80d5dad1b04deeffe1459
Updated QtTesting to use Qt5

QtTesting should use user selected Qt version
Change-Id: I22337268e9864b5fe2153309f6844cdf3ab4e4b3
WIP: Restore Qt4 and enable option to build against Qt5

Change-Id: If3cb97ff798b22a5fb4e89c0be948ca6b65ee1d1
Fixed examples to use Qt4 or Qt5 depending on user preference

Change-Id: Ieb302552284d52ed61a4f552ec4526c176392af8
Fixed ParaView macros to use both Qt4 and Qt5

Change-Id: I595069f00809082e30770e0c3e2dcd14ef8f69ae
Include ParaViewQt5.cmake instead of doing find_package(Qt5)

Change-Id: Ia356394db4c876eeeccc42845af5156749e97479
Reverted macros to use both Qt4 and Qt5

Change-Id: Ibf7b9d492b170232d3f5649ac6a0a14f4da95dd4
Add Qt5Core to the list of imported modules

Change-Id: Ibb51a044fe0b912a23cbcefc34e2eaeb2a72baa2
Plugins use either Qt4 or Qt5

Change-Id: If9915400df6917e07f700a7fc0152b4c5b9981a7
Import Qt5Widgets module at the top level

This ensures all the required Qt5 variables can be found.
For example, just importing Qt5Core does not help find QT_UIC_EXECUTABLE using
the macro "get_target_property(QT_UIC_EXECUTABLE Qt5::uic LOCATION)". This must
be a Qt5 bug.

Change-Id: Ie6f4a708682ad8cf2391d218c193d8127e4c44f7