Build a framework for a maintainable combat plugin

* Uses a hierarchy of WeaponClasses -> Weapons for performing attacks,
  with WeaponClass having a set of styles and associated Attacks for
  those styles. Weapons and their classes are built with an easy to use
  and clean DSL.

* Adds a BonusContainer mixin, so that Equipment, Weapons, and
  WeaponClasses can all have their own set of bonuses which apply to the
  player.

* Allows attacks to be queued to the Mobs CombatState instance from
  external code, allowing e.g., NPCs or auto-cast to queue attacks to be
  executed.

data/plugins/combat/weapons/two_handed_swords.rb

@@ -0,0 +1,52 @@
+TWO_HANDED_SWORD_WIDGET_ID  = 82
+TWO_HANDED_SWORD_SPECIAL_ID = 12
+
+create_weapon_class :two_handed_sword, widget: TWO_HANDED_SWORD_WIDGET_ID do
+  default_speed 7
+  special_bar TWO_HANDED_SWORD_SPECIAL_ID
+  
+  animations stand: 7047, walk: 7046, run: 7039, idle_turn: 7044, turn_around: 7044, turn_left: 7043, turn_right: 7044
+               
+  attack_bonuses stab: -4, magic: -4
+  defence_bonuses range: -1
+
+  add_style :accurate, attack_type: :slash, animation: 7041
+  add_style :aggressive, attack_type: :crush, animation: 7041
+  add_style :alt_aggressive, attack_type: :crush, animation: 7048
+  add_style :defensive, attack_type: :slash, animation: 7049
+end
+
+create_weapon :iron_2h_sword do
+  attack_bonuses slash: 13, crush: 10
+  other_bonuses melee_strength: 14
+end
+
+create_weapon :steel_2h_sword do
+  attack_bonuses slash: 21, crush: 16
+  other_bonuses melee_strength: 22
+end
+
+create_weapon /(?:black|white) 2h sword/ do
+  attack_bonuses slash: 27, crush: 21
+  other_bonuses melee_strength: 26
+end
+
+create_weapon :mithril_2h_sword do
+  attack_bonuses slash: 30, crush: 24
+  other_bonuses melee_strength: 26
+end
+
+create_weapon :adamant_2h_sword do
+  attack_bonuses slash: 43, crush: 30
+  other_bonuses melee_strength: 31
+end
+
+create_weapon :rune_2h_sword do
+  attack_bonuses slash: 69, crush: 50
+  other_bonuses melee_strength: 70
+end
+
+create_weapon :dragon_2h_sword do
+  attack_bonuses slash: 92, crush: 80
+  other_bonuses melee_strength: 70
+end