[update] Add and delete various icons

[nt1m]

Fixes #3
Fixes #30
Fixes #31
Fixes #36

[nt1m]

@bwinton Can you please review this PR ? Thanks!

[bwinton]

Could you run npm run build, to optimize the icons? Aside from that, the code looks fine. @shorlander, @bryanbell, or @brassy- should probably review the style of the icons before we merge…

[nt1m]

@bwinton These are all directly ported from m-c.

Unfortunately, npm run build rips out all the license headers, but I can look at this later today.

[nt1m]

Just to ease-up UX review:

• The autoplay icons were introduced in bug 1461656, and I believe @bryanbell created them
• The pocket outline icon was introduced in bug 1462790, and was created by @shorlander
• The tablet icon was introduced in bug 1383898 and was created by @brampitoyo
• The policy engine icons were introduced and bug 1485636 and also were created by Bram
• The left sidebar icon is just a flipped version of the right sidebar icon, and it's been introduced in bug 1347543
• The cookie icons were introduced in bug 1484312
• The cryptomining/fingerprinting icons were introduced in bug 1522567

[shorlander]

Looks good to me. Thank you!