added stb_image (not tested)
further changes stb_image
rename GB_Material to GB_Mat
added texture load function (not tested)
rename of gb_mat and gb_tex; changes in gb_mesh
added gb_model and small changes in gooseberry.h
added stb_image.c to GBTA and GB project
remove unimportant files and add filters
remove includes of stb_image and add includes to right header files
add test jpg
added .\\ notation for splitting of file names
added extract file name class (GB_Func::ExtractFile(std::string)
fix mask problem of picture files
added extracting of texture file name
fix bug of extract path