implementing StereoCameras #76

not working yet, problems with const program in convergentCamera.cpp
minor changes

add update()!!
again minor changes

(fix) correct eye position
implementing first version of convergentStereoCam

startet parallelStereocameras
correct convergent, implementing parallel
finished parallel and convergent cameras

(red cyan glasses)
side by side rendering #76

problems with glViewport
redo viewportmodificatios

add framebufferobjects (not used yet)
master merged into StereoCameras_76
occulus rift shader added

this version is not running (due to fbo incompleteness)
refactoring multiple render targets #76

not working yet
minor improvements #76
replacing framebufferobjects #76
side by side rendering (incomplete)
side by side rendering (complete)
side by side rendering for oculus rift #76

+ barrel distorsion
+ smooth fade out
added gui for cameras #76

changing camera types (after swapping buffers) causes rendering fault
(white canvas)
gui for camera types + fade out for oc. rift #76
preparing ui #76

full property functionality needs further assistment by max (#79)
gui combined with functionality #76

gui hidden