feat: added new functionality with focus, added base background to screens, created Focus.close(), Focus.start(), Focus.driven() methods for different use-cases, added focus to screens

inc/decision/decision.play_rhythm.lua

@@ -1,5 +1,12 @@
 Decision.register({
   id = "play_rhythm",
   label = "Play Rhythm Game",
-  handle = function() Meter.hide() MinigameRhythmWindow.start("game") end,
+  handle = function()
+    Meter.hide()
+    MinigameRhythmWindow.start("game", {
+      focus_center_x = Config.screen.width / 2,
+      focus_center_y = Config.screen.height / 2,
+      focus_initial_radius = 0,
+    })
+  end,
 })