Bows, quivers and arrows

• Find solution for bow and quiver placement on player sprite (as discussed in https://forums.themanaworld.org/viewtopic.php?p=153213#p153213)
• Finish training bow
• Create quiver sprite
• Add @reidy's new arrow icon (https://forums.themanaworld.org/viewtopic.php?p=153213#p153213)