new loot options for monster.xml files

you now can set attributes in the loot table of monster.xml file
example:
<item id="2379" name="Test" article="a" attack="1337" defense="13" extradefense="37" chance="80000"/><!-- dagger -->
supported tags are:
name/article/attack/defense/extradefense/armor/shootrange/hitchance
you however cannot set items which do not have that attribute before, the new attribute
example:
backpack has no armor, so you cannot set it armor now.