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- Lots of missing override definitions
- some virtual overloaded function hiding warnings
- class initializer list order

Tested on MacBook late 13 with NVIDIA GeForce GT 750M on High Sierra

* OpenGL core context is instantiated and enforced, for better forward compat
* Fixed DLL deployment to RelWithDebInfo and MinSizeRel configurations
* Bumped GLEW to 2.0.0
* Fixed wrong shading in various raycasters (normal was wrong sign)

Squashed commit of the following:

commit 21b33709371459552aff972124e9da4ae0077cf4
Author: Jakob Weiss <jakob.weiss@tum.de>
Date:   Mon Feb 6 15:21:12 2017 +0100

    Fixed number of texture unit query

commit 6592f366c7f24822a8681401cf5a415a622e5f6e
Author: Jakob Weiss <jakob.weiss@tum.de>
Date:   Mon Feb 6 14:27:36 2017 +0100

    Fixed core profile requirements

    * now using Framebuffer ARB version instead of EXT
    * fixed extension handling and windows version recognition
    * Removed pixel transfer functions usage and some validity checks for vis pipelines

commit 36c82733434e63309d092bf85f78f471b56bebfb
Author: Jakob Weiss <jakob.weiss@tum.de>
Date:   Mon Feb 6 13:50:08 2017 +0100

    Bumped glew to 2.0.0

commit 4a4a1d51756aad0e19aef9e723e1dfe7d07a797d
Author: Jakob Weiss <jakob.weiss@tum.de>
Date:   Fri Feb 3 16:26:07 2017 +0100

    First Progress - WIP

# Conflicts:
#	ext/cgt/texturemanager.cpp

Removed redundant CMake options, renamed test-campvis to campvis-test and removed pipeline and converter registration, since building shared libraries is mandatory now.

* Updated all CMake scripts to use Qt5
* CampvisApplication takes care of moving the QGLContext thread affinity to the threads that do the rendering.
* QtCanvas:resize() is called through Qt signalling to ensure being in GUI thread.
* Added init and deinit functions to the Runnable interface.
* minimum required CMake version is now 3.0

refs #249

Disabling GCC warning for using deprecated functions as we don't use this feature of GCC and ITK runs mad with these warnings.

Cleaned up CMake scripts and added correct export definitions so that now CAMPVis can easily imported into other CMake projects through FIND_PACKAGE(CAMPVis).

refs #386

* Updated CMake scripts to work with new CMake 3 and TBB 4.3

If you need one of these two C++11 headers, include <ext/threading.h> instead, which will use C++11 headers if present or TBB's compatibility layer otherwise.

closes #567

* CMake build files now support unix builds
* SWIG interface files and Lua wrappers are now fully C++ compliant to comfort GCC
* Hacked shared/static builds of the campvis-modules module even more, but now it works on both MSVC and GCC

Removed ITK dependency from CmBatchGeneration pipeline and replaced Gaussian computation with GlGaussianFilter processor.

CAMPVis used a custom option, CAMPVIS_SHARED_LIBS, to determine whether
shared or static libraries should be built. This option partially
duplicated the functionality of one of CMake's standard flags,
BUILD_SHARED_LIBS. The two could get out of sync, and because CMake only
consults BUILD_SHARED_LIBS when deciding how to build a library target,
it was possible to get inconsistent and broken build configurations.

To prevent that, add BUILD_SHARED_LIBS as an option to CAMPVis' main
CMakeLists and replace all references to CAMPVIS_SHARED_LIBS with
BUILD_SHARED_LIBS. This makes BUILD_SHARED_LIBS the only flag that
controls whether shared or static libraries are built.

References #367

Added C4251 to the ignore list for MSVC warnings, occuring due to missing template instantiations of the standard library used in public interfaces of tgt and campvis code. Even though articles such as <http://support.microsoft.com/kb/168958/en-us> provide a clean solution to fix these warnings, I decided that exporting bazillions of std library templates is not worth the effort. As we do not plan to ship TGT without the rest to a variety of systems, the missing exports won't be a problem.
BTW: The original tgt library build scripts also deactivate the warning. :)

closes #376

To build CAMPVis using NMake one had to manually copy several external
DLLs into the CMake output directory. There were 2 reasons for that:
- our macros treated NMake as a compiler and didn't try to detect what
  compiler NMake will actually use; as a result, they couldn't find the
  right external DLLs for NMake-based builds
- Visual Studio manages build types independently of CMake and always
  outputs into a build-type-specific sub-directory of the CMake output
  directory — that's where we place external DLLs; NMake, on the other
  hand, relies on CMake for build type selection and will output
  directly into the CMake output directory; due to this discrepancy,
  NMake-based builds couldn't find the external DLLs that were copied
  into the build directory

As many popular IDEs (e.g. Qt Creator, Code::Blocks, Eclipse CDT) rely
on NMake to build projects on Windows, it makes sense to have a working
support for NMake in our build system.

Update our compiler detection macros and adjust the CMake output
directory to match that of Visual Studio when NMake is used to improve
the support for NMake-based builds.

This commit explicitly marks TGT to be built as a shared library and
adds several missing TGT_API annotations to TGT classes that are
required by other CAMPVIS modules.

Added smallHeart.mhd sample volume to repository, all demo pipelines in vis module refer to this file. Hence, all vis pipelines should work out of the box from now.

 * Added a stripped version of NLOPT sources as external library, so that the registration module can be built right away.
 * Some minor improvements in CMake files

Issue #250: Make Qt dependency in tgt optional (not needed when building CAMPVis without application)

    This reverts commit 442d5051.

Added -fno-tree-vrp to CMake definition, since tree-vrp optimization breaks the code for some strange reason.

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@491 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

* introducing randomwalk module providing Athanasios' RandomWalksLib

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@450 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@448 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

* Introducing SimpleJobProcessor for dispatching non-OpenGL-related jobs

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@445 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * GenericImageRepresentationItk provides a nice wrapper around the ITK image
 * ItkImageFilter offers simple filtering using ITK

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@414 bb408c1c-ae56-11e1-83d9-df6b3e0c105e