Update alarm

[createskyblue]

1.移除二维码节省内存 2.增加可设置的欠压提醒，方便使用电池供电的用户 3.增加强制芯片过热提醒，芯片温度>80摄氏度时触发 4.在信息详细模式中报警时对应的图标闪烁 感谢由 甘草酸不酸 提供的建议 //////////////////////////////////////////////////

1. Remove QR code to save memory
2. Add a set of undervoltage reminder to facilitate battery powered users
3. Add the forced chip overheat warning, trigger when chip temperature > 80 ℃
4. in the detailed information mode, the corresponding icon is flashing when the alarm is given.

Thanks for the advice from 甘草酸不酸