So I've added the gltf functionality and the windowed mode, but before I re-release the program I gotta test it. GLTF does work out well for me because Blender wouldn't read my fbx format but it DOES read GLTF :D
By the way- it's possible the seams were caused by incorrect vertex normals calculations. I found out I made those incorrectly when I tried to apply lighting to my model. Try it now, and let me know if there are still seams. :D
