Added building component, refactored components to have setup, draw, update and tick methods, added fencing for building construction area parimeter, misc other changes.

lib/entities/buildings/helipad.rb

@@ -7,6 +7,7 @@ tiles = [
 ]
 
 IMICRTS::Entity.define_entity(:helipad, :building, 1_000, "Builds and rearms helicopters", tiles) do |entity|
+  entity.has(:building)
   entity.has(:build_queue)
   entity.has(:sidebar_actions)
   entity.component(:sidebar_actions).add(:add_to_build_queue, {entity: :helicopter})