Add better click through semantics

samples/button.rb

@@ -1,4 +1,4 @@
-App.run 720, 480, "Button Test", fps: 24
+App.run 720, 480, "Button Test", fps: 60
 
 main_scene = Scene.new
 
@@ -12,11 +12,11 @@ bg_animation = Animation.new [bg_image1, bg_image2], fps: 5
 App.language = :en
 App.localize(:en, :btn_text, "Click %{name}!")
 
-text = ElementText.new :btn_text, default_font, 0xFFFF00, {name: "Me"}, position: {x: 50, y: 50}, z: 1, click_through: true, alpha: 1
+text = ElementText.new :btn_text, default_font, 0xFFFF00, {name: "Me"}, position: {x: 50, y: 50}, z: 1, click_mode: :pass, alpha: 1
 
 rect = ElementRect.new 100, 25, 0xFF0000, position: {x: 50, y: 50}, z: 0, rotation: 60, scale: { x: 1, y: 1 }, alpha: 0.4
 
-image_element = ElementImage.new bg_animation, position: {x: 0, y: 0}, z: -1, click_through: true, alpha: 1
+image_element = ElementImage.new bg_animation, position: {x: 0, y: 0}, z: -1, click_mode: :ignore, alpha: 1
 
 pp text, rect, image_element
 
@@ -31,7 +31,7 @@ rect.on_click do
   text.params!
 end
 
-App.map_key :mouse_left, :press
+App.map_key :mouse_left, :action_name
 
 start = Time.now
 c_ = 0.0
@@ -49,9 +49,9 @@ main_scene.on_update do |delta_time|
 
   pp App.text_input if App.text_input != ""
 
-  next unless App.pressed?(:press)
+  next unless App.pressed?(:action_name)
   
-  pp "#{App.pressed?(:press)}, #{App.down?(:press)}, #{App.released?(:press)}"
+  pp "#{App.pressed?(:action_name)}, #{App.down?(:action_name)}, #{App.released?(:action_name)}"
 
   for elem in el
     if elem == image_element