Use Godot-accessible Resources folder.

Fixes #62

Resources/.gitignore

@@ -0,0 +1,7 @@
+# .import files are made by Godot because the assets are exposed if using symlinks.
+# IF you need to persist a .import file because of something used Godot-side (GUI-side),
+# you can do a negation with !.
+*.import
+# Negation would be like this:
+#!/Textures/UserInterface/handsbox.png.import
+/I_MADE_THE_SYMLINK