* only refresh view when the server URL changes (MM-34565)
Create views of current and incoming tabs indexed
by unique [URL, TABTYPE] tuples, and diffing them.
Tuples that are identical are recycled, merely
porting the new server name over.
* lint fixes
* WIP
* linting
* remove dependency on by, duad
* provide a more exaplanatory name for TabView.prototype.tuple (urlTypeTuple)
* minor improvements in viewManager
- remove stateful behaviour from makeView
- more descriptive variable names when looping
- create new arrays before sorting (sort is in-place by default)
* resolve linting errors
* Updated config, added types and classes for messaging tab
* Working app with tabs and servers
* Remainder of logic
* Make base tab abstract class
* Account for new app case
* Merge'd
* PR feedback
