Change Title, Icon, and Original URL of Pinned Tabs

[Evthestrike]

Making it possible to change the original URL of the pinned tab I think is the most important, because there is no way to really control that except making sure you have exactly the right URL when you pin the tab originally.

Changing the icon can add a level of customizability, especially because I personally conceptualize pinned tabs as web-apps.

Changing the title is less important because as it currently stands, you don't really see the title of pinned tabs. This would matter more if Zen used Arc-style pinned tabs.