Skirmisher Buffs

Some basic Skirmisher buffs so they're not utterly outshined by new-Archer.

• Buckler Training gives some armor hardiness and armor. Basically this means that they only have a bit less armor than their 1.4.9 iteration rather than being outright nerfed
• Hurricane Shot deals about 50% more damage so their AoE is less dreadful. Actually hits pretty hard now
• Changed Tireless Combatant to use strdex requirement like Combat Veteran to discourage having to hoard +wil items for requirements