Use Favico instead of Tinycon

Favico is patched to allow the use of data: urls.
betteReddit: Replace icon with a 32x32-only one

Original icon had a 16x16 version as well, which was causing the low
resolution issues.
betteReddit: Reset favicon when unloading page

Prevents notification icon from being cached in bookmarks. Per
ejci/favico.js#23.
opera: Replace Tinycon with Favico
Merge pull request #1449 from mc10/favicon

Resolve blurry favicon issues