Initial work on attaching multiple shaders into the application
Get rid of ISTON_HEADLESS variable, detect texture availability via
required 'has_texture' Drawable method. Display default yellow texture
of HTM again
Restore Object loading from Analyzer; HTM uses rotation from Drawable
Allow to set default color if texture is missing
Formattings
Fix: draw object with default color if a texture is not available
Fix boundaries calculations (a bit hacky way)
Initial resurrection of drawing Observation Path
Let SphereVertices share the same model calculated matrix
Restore GeneralizedVectors drawing
Handle key pressing in Analyzer more correct way
More correctly scale loaded object
Initial working version for HTM with generated texture
Refactor; enable lighting per drawable
Fine tune shaders
Remove unndeded shader