Sweeper.js src changed from js to ts

Hello everyone.

I have recently decided to make the choice to change the Sweeper.js from JavaScript to typescript.

The reason I have decided to do this as custom types and type checking could become useful later in dev and it is easier to change in early development then late development.

Anyway it would help a lot if you could star and help with the development of Sweeper.js on GitHub

Have a nice day and hope to see you on GitHub