Prefer Qt 5 in VTK and Qt Testing

Change-Id: I4708d4e79282d0b714cba997a9e2794cd25735b9
Bumped base CMake requirement, use Qt 5

Find and pass through QtWidgets (and QtCore/QtGui as deps), this
needs a more recent CMake as do several of the projects now they
depend on Qt 5.

Change-Id: I2d69d860d50ca8ae7643c2db00ad749ca62313ad
Bump the versions of several dependencies

This required some adjustments to one of two projects too.

Change-Id: Id351c5207894bf6b43deb741027e0c73784963da
Bumped the VTK version

Change-Id: Ic3159a5db4204ab45911f4513322b52ddb0074a2
Merge branch 'qt5'

Change-Id: Ia02b5964db1d4205d7c298a77484366c2b9f56e9