Complete special attacks; Fix WeaponClass issues

* Adds a button property to a WeaponClasses styles, which maps a combat
  style to the button that was pressed in the combat tab.

* Adds full support for special attacks, with their config IDs and
  buttons.

* Adds the DDS special attack, along with the D2H special attack as some
  starting examples.

* Rename the "no_weapon" Weapon to "unarmed", so it shows up better in
  the UI.

data/plugins/combat/weapons/unarmed.rb

@@ -1,4 +1,4 @@
-create_weapon_class :unarmed, widget: -1 do
+create_weapon_class :no_weapon, widget: 92 do
   default_speed 4
 
   add_style :accurate, animation: 422, block_animation: 424
@@ -6,6 +6,6 @@ create_weapon_class :unarmed, widget: -1 do
   add_style :defensive, animation: 422, block_animation: 424
 end
 
-create_weapon :no_weapon, :unarmed, named: true do
+create_weapon :unarmed, :no_weapon, named: true do
   # Todo factor out empty blocks
 end