Added last 2 units, added sidebar actions and build queue components, entities can now have their build actions put on the sidebar

lib/components/sidebar_actions.rb

@@ -0,0 +1,27 @@
+class IMICRTS
+  class SidebarActions < Component
+    Action = Struct.new(:label, :image, :description, :block)
+
+    attr_reader :actions
+    def initialize(parent:)
+      @parent = parent
+
+      @actions = []
+    end
+
+    def add(action, *args)
+      case action
+      when :add_to_build_queue
+        action = Action.new
+        ent = IMICRTS::Entity.get(args.first)
+        action.label = ent.name.to_s
+        action.description = "Cost: #{ent.cost}\n#{ent.description}"
+        action.block = proc { @parent.component(:build_queue).add(args.first) }
+
+        @actions << action
+      else
+        raise "Unhandled sidebar action: #{action.inspect}"
+      end
+    end
+  end
+end