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/granite_maul.rb

@@ -0,0 +1,9 @@
+create_weapon :granite_maul do
+  attack_bonuses slash: 92, crush: 80
+  other_bonuses melee_strength: 70
+
+  set_special_attack speed: 0, energy_requirement: 60, animation: 3157, graphic: 1225 do |_source, _target|
+    damage! delay: 0
+    damage! delay: 1
+  end
+end