sokoban.love/0111-populate_missing_handlers

populate_missing_handlers = function()
	for handler_name in pairs(love.handlers) do
		if on[handler_name] == nil then
			-- make it available to scripts
			on[handler_name] = function(...)
				if not Show_code then
					if car[handler_name] then
						call_protected(car[handler_name], ...)
					end
				end
			end
		end
	end
end