Major completion of basic function wrappers. Only 8 functions remain to be wrapped that have not been designated as "to-be-skipped", 2 of those should be not that difficult, but 6 others use Callbacks. Given that ICY does not support these functions it might be best to skip those also to bring SpiceyPy and ICY closer together in terms of function coverage. Updated version number to 0.5 to reflect this.