Some Usability Fixes

[Kriegstofu]

Iron Staff is usable by Infantry only tough Skrimisher is Polearm class

All Strange Swords are still usable by cav (maybe make em usable for other classes)

Highlander Armor usable by Heavy Cab (also make em usable for all Classes (xbow tier 2, skirmisher tier 3?)

Highlander Boots got more Armor than Iron Greaves

Nordic Short Warsword is usable by Inf/Archer but not Xbow/Skrm

Strange Armor Set still usable by knight (make em also usable for all classes?)

Highlander Shield got more Resistance than Swadian Steel Shield(Highlander is better in Resistance than Steel shield and kite is only little better than Highlandershield in Resistance )
Give Both Steel Shields more Resistance

Horsemans Heater Shield could be usable for Skirmisher?

?Glaive is not Buyable