Added queue support to Monarch (#49)

* Created queue and added show() as a queuable action
* Improved logic in confirm popup - It should not crash if there is no next screen in data
* Fixed indentation
* Made the new queue a lot more stable. Fixed tests.
* Removed debug output
* Fixed issue with html5 builds

example/confirm.gui_script

@@ -18,9 +18,13 @@ function on_input(self, action_id, action)
 	if action_id == hash("touch") and action.released then
 		if gui.pick_node(self.yes, action.x, action.y) then
 			print("yes")
-			monarch.show(monarch.data("confirm").next, nil, nil, function()
-				print("next screen show done")
-			end)
+			if monarch.data("confirm").next then
+				monarch.show(monarch.data("confirm").next, nil, nil, function()
+					print("next screen show done")
+				end)
+			else
+				print("no next screen in data")
+			end
 		elseif gui.pick_node(self.no, action.x, action.y) then
 			print("no")
 			monarch.back(function()

example/main.script

@@ -8,8 +8,7 @@ end
 
 function on_message(self, message_id, message, sender)
 	if message_id == hash("init_monarch") then
-		monarch.show(hash("background"), { no_stack = true }, nil, function()
-			monarch.show(hash("menu"))
-		end)
+		monarch.show(hash("background"), { no_stack = true })
+		monarch.show(hash("menu"))
 	end
 end

example/menu.gui_script

@@ -19,7 +19,7 @@ function on_input(self, action_id, action)
 			end)
 		elseif gui.pick_node(gui.get_node("about_button"), action.x, action.y) then
 			monarch.show(hash("about"), nil, nil, function()
-			print("showing about done")
+				print("showing about done")
 			end)
 		elseif gui.pick_node(gui.get_node("back_button"), action.x, action.y) then
 			monarch.back()