When tabbed out, raids aren't removed.

[NthMetal]

This causes some memory issues as new raids are added and not removed.

For each new raid that's added, a setTimeout is created that removes the raid after some time.

https://stackoverflow.com/questions/6032429/chrome-timeouts-interval-suspended-in-background-tabs

Solutions:

• Use a web worker
• Use another technique to remove raids.

[NthMetal]

fixed with 39c9078865ca833c0a812cc1c996aae05e16fa9e