[Feature Request] A switch command to add data continuously when switch is on

[animesh-007]

As suggested with @daemon1024.

Idea

/saveurl on

From here on whatever URLs are shared the links are kept in the database. Yeah will need to clean up 
things regularly, but still would be convenient 

Things that can be implemented

• [ ] A switch command to switch on the bot to listen on a particular server/channel every time.
• [ ] Delete command to delete previous messages containing links.

[raghavTinker]

Thanks for the suggestion will start working on it