Move, Delete Functions Work Now

- Fixed tab issues apparent when viewing on Github
- Cleaned up some comments
- Added specific delete function logging
- modify: now returns the number of cells modified
- modify: added more specific logging of errors
- Cleaned up some logging
- Fixed some Lua pairs vs ipairs inconsistency
- add: made coord format consistent (x, y) -> ({x, y})
- delete: works now
- move: no longer deletes item coordinates after moving
- Cleaned up testing section
- find: no longer searches inventory cells, simply asks given cell for
item