Save and load shelves from server interior_ref_lists

During CreateInteriorRefList, save shelf positions in a separate vector and ignore their buttons. In Load, recreate the shelves and their buttons from the shelf vec.

Also start storing FormIDs in a header file so I don't have to keep passing Keywords into all the functions from Papyrus.

src/utils.h

@@ -0,0 +1,3 @@
+#pragma once
+RE::NiMatrix3 get_rotation_matrix(RE::NiPoint3 rotation);
+RE::NiPoint3 rotate_point(RE::NiPoint3 point, RE::NiMatrix3 rotation_matrix);