"Fixed" client-side rendering issues

- Elemental arrows were colliding with the player, for some reason not
recognizing that it was the shooting entity; adding a data-watcher for
the shooting entity resolves the issue, but should not be necessary as
evinced by the Bomb Arrows working just fine before it was added
- trying to stop skeletons from shooting when 'stunned', seems to work;
creepers cannot be made to remain docile without reflection, though they
are still made immobile