Work at 3ds support and backend upgrades

- Track textures (not sure if this is done tbh)
- Add lithium formatters and move TextureID, TextureFormat and TextureFilter to lithium
- Only include gl-helper if any glDriver is included
- Add Li::Rect for UV stuff
- Add Li::Texture as Info holder (still thinking of making them to ptrs
- Add Check if textures are still loaded on exit

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "vendor/glfw"]
 	path = vendor/glfw
 	url = https://github.com/glfw/glfw.git
+[submodule "vendor/libpicasso"]
+	path = vendor/libpicasso
+	url = https://github.com/tobid7/libpicasso