Merge branch 'fix-warnings' of /mnt/bigone/git/repositories/sebastian.poelsterl/campvis into development

Merge branch 'shared-libs' of /mnt/bigone/git/repositories/sebastian.poelsterl/campvis into development

* Fixes #362: assignment used instead of comparison
* slight update in GlMorphologyFilter

Affected classes:
- Columbia1
- AdvancedUsFusion
- StrainFiberRenderer
- SimilarityMeasure
- GeometryRenderer
- DataContainerFileLoaderWidget
- DataContainerInspectorCanva

Fixes enumeration value not handled in switch [-Wswitch] error

* Added assertion in ImageRepresentationGL constructor checking for matching number of channels

Removed deprecated setting of shader directives for geometry shaders in tgt::ShaderManager. This hopefully fixes GeometryRenderer single-pass wireframe rendering on non-permissive GPU drivers.

* Rearranged DataContainerInspectorWidget layout to use less space
* Added option to render custom channels in DataContainerInspectorCanvas

* Support read-out of texel values also for 3D images
* introducing tgt::Texture::texelAsFloat() for 3D images
* Fixed Qt crashes in FloatPropertyWidget caused by changing GUI from non-GUI thread

* Updated GlGradientVolumeGenerator to generate GL_RGB16F textures to save memory

GUI beautification: DataContainerInspectorWidget; Save and load next to each other, hide save if no devil module, disable save btn if no item selected

* Updated TensorDemo pipeline to show fused visualization of slice and glyph rendering

Changed log level of some warnings from DEBUG to WARNING, disabled some verbose debug messages in TGT

* Fixed TrackballNavigationEventListener not saving the current scene bounds -> resetting camera too often

* Implemented GeometryDataFactory::createCube() normal generation

Fixed GeometryRenderer rendering lines and points always with wireframe color and ignoring line width.

* Fixed SliceExtractor not rendering Y slice position correctly in XZ-plane mode
* Minor improvements in DataContainerInspector fragment shader and GlGradientVolumeGenerator

Various changes to GenericImageReader and the DataContainerInspectorWidgted to get loading arbitrary images into the DataContainer running.

AutoEvaluationPipeline now also looks recursively for DataNameProperties in MetaProperties of its processors. Hence, it simulates ports also for nested processors. Furthermore, improved AutoEvaluationPipeline's documentation.

* RaycastingProcessor now has the p_targetImageID property and optionally uses a custom GLSL version for the shader
* Introducing PropertyCollection::getNestedProperty allowing to get nested properties with a single method call
* Fixed StringUtils::split() methods being broken with multi-character delimiters

C++ implicit conversion rules made ShaderManager::loadSeparate() ambiguous in some cases. So I decided to cut loose ends and completely refactored loading with standard version into ShaderManager::load() and loading with custom version into ShaderManager::loadWithCustomGlslVersion().
ShaderManager::loadSeparate() is no longer available!

* Fixed VolumeExplorer not always correctly invalidating sub-processors
* Updated ProxyGeometryGenerator to new Processor design (using INVALID_PROPERTIES invalidation level)