added bounding box class for 3d objects
implement bounding box 3d (NOT tested)
format GB_Mesh.h
add getter & setter to GB_Mesh.h
format GB_Material.h
add todo to GB_Texture.h
remove unnecessary files
added bounding box 3d, now working
GB_Model now renders bounding box when BB3D_SHOW is true
new TODO in GB_Mesh
now includes GB_BB3D class
GBTA bb is working; issue with outline color of bb
new namespaces for engine, opengl, window, app and bounding boxes for global variables; reformatting
GBTA works with changed namespaces, fixed small naming issues
removed bb lines, issue of different brightness in different angles online available for drawed lines
issue solved; different line color comes from GL_LIGHTNING and GL_LIGHT0 (maybe depends on position or light attributes)
bounding box works correctly