Conflict solving for :

 Corrected some sprites that were reversed (i.e equipping the item in the right hand would makes it appear in the left mob hand).

Sprites affected :
* giftbag
* bomb (seems unused ?!?)
* sombrero
* green sombrero
* shamebrero
* engineering jetpack
Merge pull request #3514 from Menshin/swapped_items2

(merge conflict solving) Corrected some sprites that were left/right reversed