All storage clearing

[jonathanKingston]

In #116 we cleared serviceWorkers from https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/browsingData/DataTypeSet storage to remove the WhatsApp assignment issue.

Probably worth clearing too

• cache
• cookies - this might be cleaner/faster than the current cookie clearing
• indexedDB (FF doesn't support yet)
• localStorage
• pluginData

Probably shouldn't touch

• downloads - Seems like a bad idea
• fileSystems "Website's file systems." - not entirely sure what this is (FF doesn't support yet)
• formData - Seems like a bad idea
• history - Seems like a bad idea
• passwords - Seems like a bad idea
• serverBoundCertificates - "Stored server-bound certificates." not entirely sure which certs this is, seems a bad idea anyway (FF doesn't support yet)

@groovecoder I think clearing all the others here is a good idea. Some of this will be a decision for product though.

[TanviHacks]

Duplicate of #21. jkt to file an issue for subdomains. and put anything that isn't captured in 21 into that issue.

[TanviHacks]

@jonathanKingston

[jonathanKingston]

We don't have a cookieStoreId filter on this currently. We could probably only safely do this on install of the extension. The current code path does this a lot more frequently.

@groovecoder this might be an issue that we should solve before 1.4.0 as #116 will remove the service workers on update etc.