Added sound management in savegames and load games. (#337)

Fixes #300
Fix crash on loading game when the saved position was a float while teleport_pos command needs integers.
Fix pause menu missing in simplemouse-ui, causing a crash when calling pause menu.
Co-authored-by: StraToN <StraToN@users.noreply.github.com>

game/ui/commons/pause_menu/pause_menu.gd

@@ -1,6 +1,10 @@
 extends Control
 
 
+func _ready():
+	hide()
+
+
 func _on_continue_pressed():
 	escoria.main.current_scene.game.pause_game()