urlblocker: add another yahoo ad domain
WebViewTab: make title bar and closer a bit bigger
turn cookiewhitelist into a generic cookie manager, add localStorage

When clearing cookies for a domain, also clear out any localStorage
databases that were hiding out.  This is enough to defeat
evercookie.
add an HTTP Strict Transport Security (RFC6797) implementation

It wasn't until I was about 90% finished with all of this that I
realized that WebKit already has its own HSTS implementation behind
the scenes that caches entries and has a preload list of a few
hundred domains.  Oh well.

Since we can't manipulate that list, continue with our own and
preload it with Chromium's preload list (which Mozilla also appears
to use), which currently has 1427 hosts and is freely licensed.