v1.5: Export fixes & texture detection checker

Small but important update: the Bakin Blender Export should (hopefully) work more consistently now! The bug that caused some (quite a few actually) to not work when imported in Bakin (either triangles showing up or no textures) should (hopefully) be fixed now.

Additionally, a texture checker feature was added: after selecting an object, press the scan button to get a list of all the textures it found, and what kind of texture they are. Handy if you've grabbed a model from the internet and need to see what to fiddle around with in the nodes to get it to detect again!