Added new room demonstrating a puzzle scene superposed on top of the room.

Need ESC commands to hide escoria.main.current_room and escoria.main.game.ui.*

game/rooms/room8/esc/button_puzzle.esc

@@ -0,0 +1,9 @@
+:look
+say player "That must be the command to open the door."
+
+:use
+> [!r8_m_door_open]
+	superpose_scene "res://game/rooms/room8/puzzle/10_buttons_puzzle.tscn"
+	
+> [r8_m_door_open]
+	say player "The door is already open."

game/rooms/room8/esc/button_reset_puzzle.esc

@@ -0,0 +1,6 @@
+:look
+say player "That must be the command to open the door."
+
+:use
+set_global r8_m_door_open false
+set_state r8_m_door door_close

game/rooms/room8/esc/left_exit.esc

@@ -0,0 +1,2 @@
+:exit_scene
+change_scene "res://game/rooms/room7/room7.tscn"

game/rooms/room8/esc/middle_exit.esc

@@ -0,0 +1,2 @@
+:exit_scene
+#change_scene "res://game/rooms/room9/room9.tscn"