Implement save overwrite confirmation (#368)

* Implement save overwrite confirmation + fixed pause game not pausing game execution.

* docs: Automatic update of API docs

Co-authored-by: StraToN <StraToN@users.noreply.github.com>

game/ui/commons/save/overwrite_confirm_popup.gd

@@ -0,0 +1,12 @@
+extends PopupDialog
+
+signal confirm_yes
+
+func _on_no_pressed():
+	hide()
+
+
+func _on_yes_pressed():
+	emit_signal("confirm_yes")
+	hide()
+