20200724
1. New temperature abnormal function added

2. Audio warning function added: support audio warning of no mask, temperature abnormal and flow control. (Audio files are replaceable, support wav/mp3/wma formats and max 10s)

3.Texts on back-to-business component support user self-define (If you want to display multi-language content, pls change system language of digital sigange accordingly)

4. Add new alarm icons of  no mask and temperature abnormal
5. Add 4 more templates with white background color