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/bows.rb

@@ -0,0 +1,20 @@
+BOW_WIDGET_ID      = 10
+BOW_SPECIAL_BAR_ID = 10
+# 
+# create_weapon_class :longbow, widget: BOW_WIDGET_ID do
+#   special_bar = BOW_SPECIAL_BAR_ID
+#   
+#   
+#   add_style :accurate, speed: 6, range: 7
+#   add_style :rapid, speed: 6, range: 7
+#   add_style :long_range, speed: 6, range: 9
+# end
+# 
+# create_weapon_class :shortbow, widget: BOW_WIDGET_ID do
+#   special_bar = BOW_SPECIAL_BAR_ID
+# 
+#   add_style :accurate, speed: 4, range: 7
+#   add_style :rapid, speed: 3, range: 7
+#   add_style :long_range, speed: 4, range: 9
+# end
+#