Add ranged combat support

* Clean up the CombatAction and Attack code to make it easier to use for
  range.

* Add collision detection to the distance checks before attacking in the
  CombatAction.

* Create a Ruby DSL for defining projectile types and fix the
  ProjectileUpdateOperation so it uses the correct position offset.

* Fix the packet structure of the HintIconMessageEncoder.

data/plugins/combat/weapons/melee/two_handed_swords.rb

@@ -0,0 +1,57 @@
+TWO_HANDED_SWORD_WIDGET_ID         = 82
+TWO_HANDED_SWORD_SPECIAL_CONFIG_ID = 12
+TWO_HANDED_SWORD_SPECIAL_BUTTON_ID = 10
+
+create_weapon_class :two_handed_sword, widget: TWO_HANDED_SWORD_WIDGET_ID do
+  defaults speed: 7, animation: 7041, attack_type: :slash
+  special_bar TWO_HANDED_SWORD_SPECIAL_CONFIG_ID, TWO_HANDED_SWORD_SPECIAL_BUTTON_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
+
+  style :accurate, button: 2
+  style :aggressive, attack_type: :crush, button: 3
+  style :alt_aggressive, attack_type: :crush, animation: 7048, button: 4
+  style :defensive, animation: 7049, button: 5
+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
+
+  set_special_attack speed: 7, energy_requirement: 60, animation: 3157, graphic: 1225 do |_source, _target|
+    damage!
+  end
+end