Implement usage of ammunition (Arrows, Bolts) for Bows/Crossbows

[sven-n]

At the moment, Bows and Crossbows can probably be used without consuming ammunition (Arrows, Bolts).

[sven-n]

Ideas:

• The durability of an item could act as a consumable stat attribute.
• A stat like “ammo consumption rate” which is 1 by default. Skills like Infinite Arrow multiply this stat by 0 via MagicEffect, so no consumption happens while the effect is active.
• Skills which need ammo have this stat attribute in their ConsumeRequirements.

[nmarazov]

I will start working on this feature.