work on #135: changed VisualizationProcessor::_renderTargetSize to pointer and introducing VisualizationProcessor::setViewportSizeProperty()

Revised event handling system: Got rid of campvis::AbstractEventHandler and replaced with functionality of tgt::EventListener and tgt::EventHandler

This initial .gitignore masks build by-products and project files of some
IDEs.

 * each VisualizationProcessor manages its own FBO
 * instead of creating a whole new FBO each process(), the processors shall only create and attach textures to the FBO
 * the FramebufferActivationGuard offers automatic (de)activation and detachment of all textures

SimpleRaycaster already uses the new concept, the rest still uses the legacy API

This reverts commit 240d7dab.

 * added debug output to DataContainerInspector

Conflicts:
	application/campvis.cpp
	modules/columbia/datastructures/fiberdata.cpp
	modules/columbia/datastructures/fiberdata.h
	modules/columbia/pipelines/columbia1.cpp
	modules/columbia/pipelines/columbia1.h
	modules/columbia/processors/strainfibertracker.cpp
	modules/columbia/processors/strainfibertracker.h

Revert "* fixes Issue #99"
This reverts commit 97fb9f3c.