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Introducing MultiVolumeMprRenderer processor, rendering a slice through up to 3 co-registered images at the same time. Updated NeuroDemo pipeline and implemented picking of MPR plane.

* Fixed MSVC warning in mainwindow.cpp

* Included VoxelHierarchyMapper for empty space skipping
* Now can successfully render three volumes at the same time.

Adv raycaster

See merge request !108

Who would have thought that active mip-mapping during rendering creates such artifacts...

Replaced all occurrences of GL_POLYGON render mode with GL_TRIANGLE_FAN since GL_POLYGON is deprecated.

* Added nullptr check to sigslot::signal::processSignal() (workaround to improve stability even though it should be redundant)

Shared libs support

See merge request !106

* Disabled MSVC warnings when building freetype
* Added support to copy ITK libraries

* Added modules/modulesapi.h with CAMPVIS_MODULES_API definition (MSVC __declspec switch)
* Updated modules/CMakeLists.txt to allow shared build
* Added CAMPVIS_MODULES_API to every non-templated class definition in campvis-modules

Fontrendering

See merge request !105

* Cleaned up FontAtlas and completed documentation
* Cleaned up TextRenderer, added customizable font file, added exception handling
* Added two OpenSource default fonts (FreeSans and Bitstream Vera Mono)

* Introducing TextRenderer processor that renders a simple text using the FontAtlas
* Introducing FontRenderingDemo pipeline

* Added freetype2 as external library
* Drafted FontAtlas class as simple interface to render text using OpenGL

Workflow support

See merge request !104

Introducing workflowdemo module showing a demo implementation on how to use the CAMPVis workflow interface.

refs #13

* GenericImageReader now has a property for the target image ID
* Removed all the different setters for the URL/target image ID, as you should use the corresponding properties directly.

* Workflow stages now store the visibility of pipeline canvases
* Extended PipelineFactory to also hold creator functions to create workflows
* CampVisApplication now creates and initializes workflows when launched with "-w WorkflowName" parameter

refs #13

The WorkflowControllerWidget resides as new tab on the right-hand dock area of the main window and allows to interact with an AbstractWorkflow instance.

refs #13